Doing it for the CICs – SS7 & SIGTRAN Support in FreeSWITCH (mod_isup)

· Nickvsnetworking · Aug. 23, 2026, 5:02 a.m.
history Software isdn VoIP telecom protocols FreeSWITCH SS7 SIGTRAN
Summary
This blog post discusses the author's project of implementing telecom protocols ISUP/MTP3 in FreeSWITCH using Osmocom's Sigtran stack. The author shares their enthusiasm for reviving these almost obsolete protocols, particularly their enjoyment in the implementation process over a weekend.
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