Asterisk Lags Behind Other Platforms in SIP over TCP Support
Alex Lewis over at NetworkWorld has written a story on SIP protocol support (UDP, TCP, TLS). Currently, Asterisk only supports SIP over UDP, and is lagging behind most of the “Tier 1” vendors in support for SIP over TCP.
Alex’s story includes a comparison of platforms and supported SIP frameworks.
I did find a SIP over TCP patch in development here, but it does not appear to have much developer activity in the past few months.