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Cisco Bug: CSCub20591 - TCP connection times out on H323 Call (Firewall issue)

Last Modified

Dec 11, 2018

Products (1)

  • Cisco Telepresence Integrator C Series

Known Affected Releases

unspecified

Description (partial)

Symptom:
video calls using Cisco TelePresence codec fail after some time (for example 30 minutes) when using H323
Conditions:
When placing H323 calls between Cisco TelePresence codecs, the call may drop if there is a firewall located between the codec and the device (VCS for example) that is handling the h225 signaling.  Cisco TelePresence codecs use H245 round-trip request and response sent every 30 seconds as a keepalive.

Not all firewalls will monitor the H245 session of a H323 and this can causes issues where calls will drop after some amount of time; for example 30 minutes.

Prior to TC6, there was no TCP keepalive used for the H225 session.  Starting with TC6, a 7200 second (120 minute) TCP timer was enabled which is not configurable.
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