03-09-2015 10:23 PM - edited 03-18-2019 04:09 AM
In the setup, CUCM is the centralized call controller and expressways are used for firewall traversal. CUCM & expressways are correctly as per the Cisco document. A SIP call from a public internet endpoint to CUCM registered MX300 G2 is successfully connected with video & audio. But a H.323 call from public internet endpoint to the MX300 G2 in CUCM is failing. It is seen in the logs that there is a OpenLogicalChannel reject for the audio codec. I tried with both G711 & G729 from the public endpoint, but the result is the same. Has anyone here faced similar problems. Is there anything that I have look at. Thanks in advance.
03-10-2015 03:18 AM
Do you use encryption? Does it still behave like that if you handle the call unencrypted in your
expressway and cucm setup?
I would also check your (or the firewall for the remote setup) if there is anything messing with the h323 signaling (nat helper, inspection, l3gw, alg, ...)
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03-10-2015 05:04 AM
Hi Martin,
Thanks for the response. I can look at the firewall. But I would like to understand how does firewall can be a factor here when there is a clear OLC Reject. Is it not confirms that the packets are indeed received and there are some issues in opening the logical channel.
As firewall is not in my scope, I need to make clear reason for the other team to look at.
Thanks.
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