Call between a SIP phone and a remote one through H.323 trunk doesn't resume after putting on hold
I have configured an H.323 trunk between an Avaya (that don't support SIP) and a CME. As the trunk goes through a WAN link I am using G729 codec for this trunk. The phones I am using in the CME side are 7841 with G711 codec. The CME has transcoding configured. Currently I am able to make calls between both sides in both ways and the audio works fine. However, when I put the call on hold in the 7841 and resume the call, the call remains up but the audio stops passing through. That doesn't happen if I configure the 7841 phones with G729 codec. It seems the problem is due to the use of transcoding. Do you know a way to make this feature (hold) work in this situation?
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...