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Companies using SIP/2.0

As of 14 October 2026, Firmable tracks 13 companies across 13 countries running SIP/2.0. See who they are, and who to call.

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Companies using SIP/2.0

Showing 5 of 13 companies

CallTower Inc.

calltower.com · Telecommunications services · 251–500 employees

Last seen 5 Oct 2026 The most recent date Firmable detected SIP/2.0 at this company.

Decision makers · 82 on file Senior people on file at this company. Firmable holds their names, emails and mobiles.

Director of Telecommunications MobileEmail
Chief Information Officer MobileEmail

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Signals Recent events at this company, such as a leadership change, funding or a new office.

Hired as Chief Technology Officer · 1 Oct 2026

Momentum Telecom sells cloud voice and collaboration business assets to CallTower on Oct 1st '26 · 1 Oct 2026

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Vianet

vianet.ca · Internet services and web portals · 251–500 employees

Last seen 5 Oct 2026 The most recent date Firmable detected SIP/2.0 at this company.

Decision makers · 13 on file Senior people on file at this company. Firmable holds their names, emails and mobiles.

Vice President of Operations Vianet USA MobileEmail
Manager of Information Systems and Cybersecurity Email

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Signals Recent events at this company, such as a leadership change, funding or a new office.

Vianet announced the acquisition of NetSpectrum's Internet Division, expanding regional service capabilities in Ontario. · 20 Jul 2026

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iTel Networks

itel.com · Telecommunications services · 51–250 employees

Last seen 14 Oct 2026 The most recent date Firmable detected SIP/2.0 at this company.

Decision makers · 27 on file Senior people on file at this company. Firmable holds their names, emails and mobiles.

CTO MobileEmail
Support and Network Operations Manager MobileEmail

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Signals Recent events at this company, such as a leadership change, funding or a new office.

No signals recorded

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CenturyLink

centurylink.com · Internet services and web portals · 10,001+ employees

Last seen 27 Sep 2026 The most recent date Firmable detected SIP/2.0 at this company.

Decision makers · 2.9K+ on file Senior people on file at this company. Firmable holds their names, emails and mobiles.

Vice President, Advance Technology Solutions MobileEmail
Director: Environmental, Outside Plant, & Wireless - Strategy & Development MobileEmail

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Signals Recent events at this company, such as a leadership change, funding or a new office.

No signals recorded

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WTC Communications

wtccommunications.ca · Cybersecurity · 51–250 employees

Last seen 12 Oct 2026 The most recent date Firmable detected SIP/2.0 at this company.

Decision makers · 9 on file Senior people on file at this company. Firmable holds their names, emails and mobiles.

Technical Support Supervisor MobileEmail
Marketing Manager MobileEmail

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Signals Recent events at this company, such as a leadership change, funding or a new office.

Coloware signed new client WTC Communications on Sep 29th '26. · 29 Sep 2026

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Who uses SIP/2.0

A breakdown of the 13 companies running SIP/2.0.

Top industries

Information technology and services7
Media and telecommunications4
Agriculture, forestry and fishing1
Professional and business services1

Company size

11–501 (8%)
51–2504 (33%)
251–5002 (17%)
1,001–5,0003 (25%)
10,001+2 (17%)

Share of companies with a recorded size, by employees.

No size recorded: 1

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Frequently asked questions

About the SIP/2.0 data on this page.

How many companies use SIP/2.0?

Firmable holds confirmed SIP/2.0 detections for 13 distinct companies, 13 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.

Which companies use SIP/2.0?

CallTower Inc., Vianet and iTel Networks are among the most prominent in the current set.

What industries use SIP/2.0?

Information technology and services, media and telecommunications and agriculture, forestry and fishing lead the set, across 5 industries in total.

What size companies use SIP/2.0?

Adoption concentrates in the 51-250 employee band, across the companies whose size is recorded.

Where are SIP/2.0 users based?

The United States, Canada, Australia and the Philippines account for most detections, across 13 countries.

How current is this data?

13 companies were confirmed in the last 90 days. Last detection 14 October 2026.

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