1 Report Overview 1.1 Study Scope 1.2 Market Analysis by Type 1.2.1 Global PBX Phone System Market Size Growth Rate by Type: 2016 VS 2021 VS 2027 1.2.2 Traditional PBX/Analogue PBX 1.2.3 Hosted PBX 1.2.4 VoIP/IP PBX 1.3 Market by Application 1.3.1 Global PBX Phone System Market Share by Application: 2016 VS 2021 VS 2027 1.3.2 SMEs 1.3.3 Large Enterprise 1.4 Study Objectives 1.5 Years Considered 2 Global Growth Trends 2.1 Global PBX Phone System Market Perspective (2016-2027) 2.2 PBX Phone System Growth Trends by Regions 2.2.1 PBX Phone System Market Size by Regions: 2016 VS 2021 VS 2027 2.2.2 PBX Phone System Historic Market Share by Regions (2016-2021) 2.2.3 PBX Phone System Forecasted Market Size by Regions (2022-2027) 2.3 PBX Phone System Industry Dynamic 2.3.1 PBX Phone System Market Trends 2.3.2 PBX Phone System Market Drivers 2.3.3 PBX Phone System Market Challenges 2.3.4 PBX Phone System Market Restraints 3 Competition Landscape by Key Players 3.1 Global Top PBX Phone System Players by Revenue 3.1.1 Global Top PBX Phone System Players by Revenue (2016-2021) 3.1.2 Global PBX Phone System Revenue Market Share by Players (2016-2021) 3.2 Global PBX Phone System Market Share by Company Type (Tier 1, Tier 2 and Tier 3) 3.3 Players Covered: Ranking by PBX Phone System Revenue 3.4 Global PBX Phone System Market Concentration Ratio 3.4.1 Global PBX Phone System Market Concentration Ratio (CR5 and HHI) 3.4.2 Global Top 10 and Top 5 Companies by PBX Phone System Revenue in 2020 3.5 PBX Phone System Key Players Head office and Area Served 3.6 Key Players PBX Phone System Product Solution and Service 3.7 Date of Enter into PBX Phone System Market 3.8 Mergers & Acquisitions, Expansion Plans 4 PBX Phone System Breakdown Data by Type 4.1 Global PBX Phone System Historic Market Size by Type (2016-2021) 4.2 Global PBX Phone System Forecasted Market Size by Type (2022-2027) 5 PBX Phone System Breakdown Data by Application 5.1 Global PBX Phone System Historic Market Size by Application (2016-2021) 5.2 Global PBX Phone System Forecasted Market Size by Application (2022-2027) 6 North America 6.1 North America PBX Phone System Market Size (2016-2027) 6.2 North America PBX Phone System Market Size by Type 6.2.1 North America PBX Phone System Market Size by Type (2016-2021) 6.2.2 North America PBX Phone System Market Size by Type (2022-2027) 6.2.3 North America PBX Phone System Market Size by Type (2016-2027) 6.3 North America PBX Phone System Market Size by Application 6.3.1 North America PBX Phone System Market Size by Application (2016-2021) 6.3.2 North America PBX Phone System Market Size by Application (2022-2027) 6.3.3 North America PBX Phone System Market Size by Application (2016-2027) 6.4 North America PBX Phone System Market Size by Country 6.4.1 North America PBX Phone System Market Size by Country (2016-2021) 6.4.2 North America PBX Phone System Market Size by Country (2022-2027) 6.4.3 United States 6.4.4 Canada 7 Europe 7.1 Europe PBX Phone System Market Size (2016-2027) 7.2 Europe PBX Phone System Market Size by Type 7.2.1 Europe PBX Phone System Market Size by Type (2016-2021) 7.2.2 Europe PBX Phone System Market Size by Type (2022-2027) 7.2.3 Europe PBX Phone System Market Size by Type (2016-2027) 7.3 Europe PBX Phone System Market Size by Application 7.3.1 Europe PBX Phone System Market Size by Application (2016-2021) 7.3.2 Europe PBX Phone System Market Size by Application (2022-2027) 7.3.3 Europe PBX Phone System Market Size by Application (2016-2027) 7.4 Europe PBX Phone System Market Size by Country 7.4.1 Europe PBX Phone System Market Size by Country (2016-2021) 7.4.2 Europe PBX Phone System Market Size by Country (2022-2027) 7.4.3 Germany 7.4.4 France 7.4.5 U.K. 7.4.6 Italy 7.4.7 Russia 7.4.8 Nordic 8 Asia-Pacific 8.1 Asia-Pacific PBX Phone System Market Size (2016-2027) 8.2 Asia-Pacific PBX Phone System Market Size by Type 8.2.1 Asia-Pacific PBX Phone System Market Size by Type (2016-2021) 8.2.2 Asia-Pacific PBX Phone System Market Size by Type (2022-2027) 8.2.3 Asia-Pacific PBX Phone System Market Size by Type (2016-2027) 8.3 Asia-Pacific PBX Phone System Market Size by Application 8.3.1 Asia-Pacific PBX Phone System Market Size by Application (2016-2021) 8.3.2 Asia-Pacific PBX Phone System Market Size by Application (2022-2027) 8.3.3 Asia-Pacific PBX Phone System Market Size by Application (2016-2027) 8.4 Asia-Pacific PBX Phone System Market Size by Region 8.4.1 Asia-Pacific PBX Phone System Market Size by Region (2016-2021) 8.4.2 Asia-Pacific PBX Phone System Market Size by Region (2022-2027) 8.4.3 China 8.4.4 Japan 8.4.5 South Korea 8.4.6 Southeast Asia 8.4.7 India 8.4.8 Australia 9 Latin America 9.1 Latin America PBX Phone System Market Size (2016-2027) 9.2 Latin America PBX Phone System Market Size by Type 9.2.1 Latin America PBX Phone System Market Size by Type (2016-2021) 9.2.2 Latin America PBX Phone System Market Size by Type (2022-2027) 9.2.3 Latin America PBX Phone System Market Size by Type (2016-2027) 9.3 Latin America PBX Phone System Market Size by Application 9.3.1 Latin America PBX Phone System Market Size by Application (2016-2021) 9.3.2 Latin America PBX Phone System Market Size by Application (2022-2027) 9.3.3 Latin America PBX Phone System Market Size by Application (2016-2027) 9.4 Latin America PBX Phone System Market Size by Country 9.4.1 Latin America PBX Phone System Market Size by Country (2016-2021) 9.4.2 Latin America PBX Phone System Market Size by Country (2022-2027) 9.4.3 Mexico 9.4.4 Brazil 10 Middle East & Africa 10.1 Middle East & Africa PBX Phone System Market Size (2016-2027) 10.2 Middle East & Africa PBX Phone System Market Size by Type 10.2.1 Middle East & Africa PBX Phone System Market Size by Type (2016-2021) 10.2.2 Middle East & Africa PBX Phone System Market Size by Type (2022-2027) 10.2.3 Middle East & Africa PBX Phone System Market Size by Type (2016-2027) 10.3 Middle East & Africa PBX Phone System Market Size by Application 10.3.1 Middle East & Africa PBX Phone System Market Size by Application (2016-2021) 10.3.2 Middle East & Africa PBX Phone System Market Size by Application (2022-2027) 10.3.3 Middle East & Africa PBX Phone System Market Size by Application (2016-2027) 10.4 Middle East & Africa PBX Phone System Market Size by Country 10.4.1 Middle East & Africa PBX Phone System Market Size by Country (2016-2021) 10.4.2 Middle East & Africa PBX Phone System Market Size by Country (2022-2027) 10.4.3 Turkey 10.4.4 Saudi Arabia 10.4.5 UAE 11 Key Players Profiles 11.1 3CX 11.1.1 3CX Company Details 11.1.2 3CX Business Overview 11.1.3 3CX PBX Phone System Introduction 11.1.4 3CX Revenue in PBX Phone System Business (2016-2021) 11.1.5 3CX Recent Development 11.2 Twilio 11.2.1 Twilio Company Details 11.2.2 Twilio Business Overview 11.2.3 Twilio PBX Phone System Introduction 11.2.4 Twilio Revenue in PBX Phone System Business (2016-2021) 11.2.5 Twilio Recent Development 11.3 Veritas Technologies 11.3.1 Veritas Technologies Company Details 11.3.2 Veritas Technologies Business Overview 11.3.3 Veritas Technologies PBX Phone System Introduction 11.3.4 Veritas Technologies Revenue in PBX Phone System Business (2016-2021) 11.3.5 Veritas Technologies Recent Development 11.4 Voicent 11.4.1 Voicent Company Details 11.4.2 Voicent Business Overview 11.4.3 Voicent PBX Phone System Introduction 11.4.4 Voicent Revenue in PBX Phone System Business (2016-2021) 11.4.5 Voicent Recent Development 11.5 CallFire 11.5.1 CallFire Company Details 11.5.2 CallFire Business Overview 11.5.3 CallFire PBX Phone System Introduction 11.5.4 CallFire Revenue in PBX Phone System Business (2016-2021) 11.5.5 CallFire Recent Development 11.6 Symantec 11.6.1 Symantec Company Details 11.6.2 Symantec Business Overview 11.6.3 Symantec PBX Phone System Introduction 11.6.4 Symantec Revenue in PBX Phone System Business (2016-2021) 11.6.5 Symantec Recent Development 11.7 Microsoft (Skype) 11.7.1 Microsoft (Skype) Company Details 11.7.2 Microsoft (Skype) Business Overview 11.7.3 Microsoft (Skype) PBX Phone System Introduction 11.7.4 Microsoft (Skype) Revenue in PBX Phone System Business (2016-2021) 11.7.5 Microsoft (Skype) Recent Development 11.8 Nextiva 11.8.1 Nextiva Company Details 11.8.2 Nextiva Business Overview 11.8.3 Nextiva PBX Phone System Introduction 11.8.4 Nextiva Revenue in PBX Phone System Business (2016-2021) 11.8.5 Nextiva Recent Development 11.9 RingCentral 11.9.1 RingCentral Company Details 11.9.2 RingCentral Business Overview 11.9.3 RingCentral PBX Phone System Introduction 11.9.4 RingCentral Revenue in PBX Phone System Business (2016-2021) 11.9.5 RingCentral Recent Development 11.10 Mitel 11.10.1 Mitel Company Details 11.10.2 Mitel Business Overview 11.10.3 Mitel PBX Phone System Introduction 11.10.4 Mitel Revenue in PBX Phone System Business (2016-2021) 11.10.5 Mitel Recent Development 11.11 Vonage 11.11.1 Vonage Company Details 11.11.2 Vonage Business Overview 11.11.3 Vonage PBX Phone System Introduction 11.11.4 Vonage Revenue in PBX Phone System Business (2016-2021) 11.11.5 Vonage Recent Development 11.12 ShareTel 11.12.1 ShareTel Company Details 11.12.2 ShareTel Business Overview 11.12.3 ShareTel PBX Phone System Introduction 11.12.4 ShareTel Revenue in PBX Phone System Business (2016-2021) 11.12.5 ShareTel Recent Development 12 Analyst's Viewpoints/Conclusions 13 Appendix 13.1 Research Methodology 13.1.1 Methodology/Research Approach 13.1.2 Data Source 13.2 Disclaimer 13.3 Author Details

List of Tables Table 1. Global PBX Phone System Market Size Growth Rate by Type (US$ Million):2016 VS 2021 VS 2027 Table 2. Key Players of Traditional PBX/Analogue PBX Table 3. Key Players of Hosted PBX Table 4. Key Players of VoIP/IP PBX Table 5. Global PBX Phone System Market Size Growth by Application (US$ Million): 2016 VS 2021 VS 2027 Table 6. Global PBX Phone System Market Size by Regions (US$ Million): 2016 VS 2021 VS 2027 Table 7. Global PBX Phone System Market Size by Regions (2016-2021) & (US$ Million) Table 8. Global PBX Phone System Market Share by Regions (2016-2021) Table 9. Global PBX Phone System Forecasted Market Size by Regions (2022-2027) & (US$ Million) Table 10. Global PBX Phone System Market Share by Regions (2022-2027) Table 11. PBX Phone System Market Trends Table 12. PBX Phone System Market Drivers Table 13. PBX Phone System Market Challenges Table 14. PBX Phone System Market Restraints Table 15. Global PBX Phone System Revenue by Players (2016-2021) & (US$ Million) Table 16. Global PBX Phone System Market Share by Players (2016-2021) Table 17. Global Top PBX Phone System Players by Company Type (Tier 1, Tier 2 and Tier 3) (based on the Revenue in PBX Phone System as of 2020) Table 18. Ranking of Global Top PBX Phone System Companies by Revenue (US$ Million) in 2020 Table 19. Global 5 Largest Players Market Share by PBX Phone System Revenue (CR5 and HHI) & (2016-2021) Table 20. Key Players Headquarters and Area Served Table 21. Key Players PBX Phone System Product Solution and Service Table 22. Date of Enter into PBX Phone System Market Table 23. Mergers & Acquisitions, Expansion Plans Table 24. Global PBX Phone System Market Size by Type (2016-2021) (US$ Million) Table 25. Global PBX Phone System Revenue Market Share by Type (2016-2021) Table 26. Global PBX Phone System Forecasted Market Size by Type (2022-2027) (US$ Million) Table 27. Global PBX Phone System Revenue Market Share by Type (2022-2027) & (US$ Million) Table 28. Global PBX Phone System Market Size Share by Application (2016-2021) & (US$ Million) Table 29. Global PBX Phone System Revenue Market Share by Application (2016-2021) Table 30. Global PBX Phone System Forecasted Market Size by Application (2022-2027) (US$ Million) Table 31. Global PBX Phone System Revenue Market Share by Application (2022-2027) & (US$ Million) Table 32. North America PBX Phone System Market Size by Type (2016-2021) (US$ Million) Table 33. North America PBX Phone System Market Size by Type (2022-2027) & (US$ Million) Table 34. North America PBX Phone System Market Size by Application (2016-2021) (US$ Million) Table 35. North America PBX Phone System Market Size by Application (2022-2027) & (US$ Million) Table 36. North America PBX Phone System Market Size by Country (2016-2021) & (US$ Million) Table 37. North America PBX Phone System Market Size by Country (2022-2027) & (US$ Million) Table 38. Europe PBX Phone System Market Size by Type (2016-2021) (US$ Million) Table 39. Europe PBX Phone System Market Size by Type (2022-2027) & (US$ Million) Table 40. Europe PBX Phone System Market Size by Application (2016-2021) (US$ Million) Table 41. Europe PBX Phone System Market Size by Application (2022-2027) & (US$ Million) Table 42. Europe PBX Phone System Market Size by Country (2016-2021) & (US$ Million) Table 43. Europe PBX Phone System Market Size by Country (2022-2027) & (US$ Million) Table 44. Asia-Pacific PBX Phone System Market Size by Type (2016-2021) (US$ Million) Table 45. Asia-Pacific PBX Phone System Market Size by Type (2022-2027) & (US$ Million) Table 46. Asia-Pacific PBX Phone System Market Size by Application (2016-2021) (US$ Million) Table 47. Asia-Pacific PBX Phone System Market Size by Application (2022-2027) & (US$ Million) Table 48. Asia-Pacific PBX Phone System Market Size by Region (2016-2021) & (US$ Million) Table 49. Asia-Pacific PBX Phone System Market Size by Region (2022-2027) & (US$ Million) Table 50. Latin America PBX Phone System Market Size by Type (2016-2021) (US$ Million) Table 51. Latin America PBX Phone System Market Size by Type (2022-2027) & (US$ Million) Table 52. Latin America PBX Phone System Market Size by Application (2016-2021) (US$ Million) Table 53. Latin America PBX Phone System Market Size by Application (2022-2027) & (US$ Million) Table 54. Latin America PBX Phone System Market Size by Country (2016-2021) & (US$ Million) Table 55. Latin America PBX Phone System Market Size by Country (2022-2027) & (US$ Million) Table 56. Middle East & Africa PBX Phone System Market Size by Type (2016-2021) (US$ Million) Table 57. Middle East & Africa PBX Phone System Market Size by Type (2022-2027) & (US$ Million) Table 58. Middle East & Africa PBX Phone System Market Size by Application (2016-2021) (US$ Million) Table 59. Middle East & Africa PBX Phone System Market Size by Application (2022-2027) & (US$ Million) Table 60. Middle East & Africa PBX Phone System Market Size by Country (2016-2021) & (US$ Million) Table 61. Middle East & Africa PBX Phone System Market Size by Country (2022-2027) & (US$ Million) Table 62. 3CX Company Details Table 63. 3CX Business Overview Table 64. 3CX PBX Phone System Product Table 65. 3CX Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 66. 3CX Recent Development Table 67. Twilio Company Details Table 68. Twilio Business Overview Table 69. Twilio PBX Phone System Product Table 70. Twilio Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 71. Twilio Recent Development Table 72. Veritas Technologies Company Details Table 73. Veritas Technologies Business Overview Table 74. Veritas Technologies PBX Phone System Product Table 75. Veritas Technologies Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 76. Veritas Technologies Recent Development Table 77. Voicent Company Details Table 78. Voicent Business Overview Table 79. Voicent PBX Phone System Product Table 80. Voicent Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 81. Voicent Recent Development Table 82. CallFire Company Details Table 83. CallFire Business Overview Table 84. CallFire PBX Phone System Product Table 85. CallFire Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 86. CallFire Recent Development Table 87. Symantec Company Details Table 88. Symantec Business Overview Table 89. Symantec PBX Phone System Product Table 90. Symantec Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 91. Symantec Recent Development Table 92. Microsoft (Skype) Company Details Table 93. Microsoft (Skype) Business Overview Table 94. Microsoft (Skype) PBX Phone System Product Table 95. Microsoft (Skype) Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 96. Microsoft (Skype) Recent Development Table 97. Nextiva Company Details Table 98. Nextiva Business Overview Table 99. Nextiva Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 100. Nextiva Recent Development Table 101. RingCentral Company Details Table 102. RingCentral Business Overview Table 103. RingCentral PBX Phone System Product Table 104. RingCentral Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 105. RingCentral Recent Development Table 106. Mitel Company Details Table 107. Mitel Business Overview Table 108. Mitel PBX Phone System Product Table 109. Mitel Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 110. Mitel Recent Development Table 111. Vonage Company Details Table 112. Vonage Business Overview Table 113. Vonage PBX Phone System Product Table 114. Vonage Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 115. Vonage Recent Development Table 116. ShareTel Company Details Table 117. ShareTel Business Overview Table 118. ShareTel PBX Phone System Product Table 119. ShareTel Revenue in PBX Phone System Business (2016-2021) & (US$ Million) Table 120. ShareTel Recent Development Table 121. Research Programs/Design for This Report Table 122. Key Data Information from Secondary Sources Table 123. Key Data Information from Primary Sources List of Figures Figure 1. Global PBX Phone System Market Share by Type: 2020 VS 2027 Figure 2. Traditional PBX/Analogue PBX Features Figure 3. Hosted PBX Features Figure 4. VoIP/IP PBX Features Figure 5. Global PBX Phone System Market Share by Application: 2020 VS 2027 Figure 6. SMEs Case Studies Figure 7. Large Enterprise Case Studies Figure 8. PBX Phone System Report Years Considered Figure 9. Global PBX Phone System Market Size (US$ Million), Year-over-Year: 2016-2027 Figure 10. Global PBX Phone System Market Size (US$ Million), 2016 VS 2021 VS 2027 Figure 11. Global PBX Phone System Market Share by Regions: 2020 VS 2027 Figure 12. Global PBX Phone System Market Share by Regions (2022-2027) Figure 13. Global PBX Phone System Market Share by Players in 2020 Figure 14. Global Top PBX Phone System Players by Company Type (Tier 1, Tier 2 and Tier 3) (based on the Revenue in PBX Phone System as of 2020 Figure 15. The Top 10 and 5 Players Market Share by PBX Phone System Revenue in 2020 Figure 16. Global PBX Phone System Revenue Market Share by Type (2016-2021) Figure 17. Global PBX Phone System Revenue Market Share by Type (2022-2027) Figure 18. North America PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 19. North America PBX Phone System Market Share by Type (2016-2027) Figure 20. North America PBX Phone System Market Share by Application (2016-2027) Figure 21. North America PBX Phone System Market Share by Country (2016-2027) Figure 22. United States PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 23. Canada PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 24. Europe PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 25. Europe PBX Phone System Market Share by Type (2016-2027) Figure 26. Europe PBX Phone System Market Share by Application (2016-2027) Figure 27. Europe PBX Phone System Market Share by Country (2016-2027) Figure 28. Germany PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 29. France PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 30. U.K. PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 31. Italy PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 32. Russia PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 33. Nordic PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 34. Asia-Pacific PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 35. Asia-Pacific PBX Phone System Market Share by Type (2016-2027) Figure 36. Asia-Pacific PBX Phone System Market Share by Application (2016-2027) Figure 37. Asia-Pacific PBX Phone System Market Share by Region (2016-2027) Figure 38. China PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 39. Japan PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 40. South Korea PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 41. Southeast Asia PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 42. India PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 43. Australia PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 44. Latin America PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 45. Latin America PBX Phone System Market Share by Type (2016-2027) Figure 46. Latin America PBX Phone System Market Share by Application (2016-2027) Figure 47. Latin America PBX Phone System Market Share by Country (2016-2027) Figure 48. Mexico PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 49. Brazil PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 50. Middle East & Africa PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 51. Middle East & Africa PBX Phone System Market Share by Type (2016-2027) Figure 52. Middle East & Africa PBX Phone System Market Share by Application (2016-2027) Figure 53. Middle East & Africa PBX Phone System Market Share by Country (2016-2027) Figure 54. Turkey PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 55. Saudi Arabia PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 56. UAE PBX Phone System Market Size YoY Growth (2016-2027) & (US$ Million) Figure 57. 3CX Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 58. Twilio Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 59. Veritas Technologies Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 60. Voicent Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 61. CallFire Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 62. Symantec Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 63. Microsoft (Skype) Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 64. Nextiva Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 65. RingCentral Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 66. Mitel Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 67. Vonage Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 68. ShareTel Revenue Growth Rate in PBX Phone System Business (2016-2021) Figure 69. Bottom-up and Top-down Approaches for This Report Figure 70. Data Triangulation Figure 71. Key Executives Interviewed

3CX Twilio Veritas Technologies Voicent CallFire Symantec Microsoft (Skype) Nextiva RingCentral Mitel Vonage ShareTel