As of 14 October 2026, Firmable tracks 40,427 companies across 13 countries running SIP (Session Initiation Protocol). See who they are, and who to call.
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About Tech Intelligence
Every company leaves a trace across the internet. Tech Intelligence finds it.
A breakdown of the 40K+ companies running SIP (Session Initiation Protocol).
Top industries
Information technology and services4.6K+
Industrial and manufacturing4.3K+
Professional and business services4K+
Financial services3.2K+
Education and training2.7K+
Construction and building2.5K+
Media and telecommunications1.8K+
Health and wellness1.7K+
No industry recorded: 4.9K+
Company size
1–104,363 (13%)
11–505,811 (17%)
51–2508,232 (25%)
251–5004,420 (13%)
501–1,0002,814 (8%)
1,001–5,0005,176 (15%)
5,001–10,0001,277 (4%)
10,001+1,408 (4%)
Share of companies with a recorded size, by employees.
No size recorded: 6.9K+
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Frequently asked questions
About the SIP (Session Initiation Protocol) data on this page.
How many companies use SIP (Session Initiation Protocol)?
Firmable holds confirmed SIP (Session Initiation Protocol) detections for 40,427 distinct companies, 40,273 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use SIP (Session Initiation Protocol)?
Cresset, McGrathNicol and GCI Health are among the most prominent in the current set.
What industries use SIP (Session Initiation Protocol)?
Information technology and services, industrial and manufacturing and professional and business services lead the set, across 19 industries in total.
What size companies use SIP (Session Initiation Protocol)?
Adoption concentrates in the 51-250 employee band, across the companies whose size is recorded.
Where are SIP (Session Initiation Protocol) users based?
The United States, Australia, Canada and Indonesia account for most detections, across 13 countries.
How current is this data?
40,273 companies were confirmed in the last 90 days. Last detection 14 October 2026.
