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Cisco Bug: CSCum26134 - MCU sets SIP domain name for Contact-URI in a direct call

Last Modified

May 26, 2016

Products (15)

  • Cisco TelePresence MCU 4500 Series
  • Cisco TelePresence MCU 4520
  • Cisco TelePresence MCU 4505
  • Cisco TelePresence MCU 4510
  • Cisco TelePresence MCU 5320
  • Cisco TelePresence MCU 4215
  • Cisco TelePresence MCU 4205
  • Cisco TelePresence MCU 4220
  • Cisco TelePresence MCU MSE 8420
  • Cisco TelePresence MCU 4203
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Known Affected Releases

4.4(3.49) 4.4(3.57)

Description (partial)

MCU responds with 200 OK for an incoming direct call from an endpoint on Port B.
The SIP domain name is set to the Contact header URI on the 200 OK response.
Then, the endpoint cannot resolve the domain name and cannot send ACK to the MCU.
As a result, the call is failed.

On the same settings, auto attendant call is no problem.
In this case, MCU sets its IP address to the Contact header URI on the 200 OK response. It's the ideal behavior.

Register MCU Port A to a gatekeeper and don't register MCU Port B.
Enable "Video Firewall" feature on the MCU.
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Bug Details Include

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