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Cisco TelePresence MCU 4200 Series

Cisco TelePresence MCU/IP endpoint not receiving video from a System MXP endpoint when an ISDN GW is used

Why doesn't my Cisco TelePresence MCU or IP endpoint receive any video from a Cisco TelePresence System MXP endpoint when using a Cisco TelePresence ISDN GW?

This article applies to the following products:

  • Cisco TelePresence ISDN GW 3200 and 3241 / MSE 8310 and 8321 ISDN blades
  • Cisco TelePresence MCU 4200 Series
  • Cisco TelePresence MCU 4500 Series
  • Cisco TelePresence MCU 5300 Series
  • Cisco TelePresence MCU MSE Series

Please check the Cisco TelePresence interoperability database, or the Interoperability section in your product release notes, for known interoperability issues between the endpoint and the Cisco TelePresence infrastructure equipment.

Also, on the Cisco TelePresence System MXP's web interface go to System Configuration > ISDN/H.320 Network and make sure that H.331 is disabled. (If it is enabled, disable it now). Then check whether the video problem is solved.

In the past, customers whose endpoint had this option enabled were unable to send any video to the ISDN GW. The H.331 protocol is a standard for broadcasting and when this is enabled, it only sends data from the transmitter to the receiver and prevents any H.320 terminals sending information back from the receiver to the transmitter. If this option is enabled on the Cisco TelePresence endpoint, then even though it will be able to receive video from the ISDN GW, the H.331 protocol will not allow it to send any video back to the ISDN GW and, as a result, the MCU or the IP endpoint will not receive any video either.


Jan 22nd, 2013 TAA_KB_135