This is because it is the "best quality" CODEC that can be negotiated. So, as long as you have the G722 CODEC enabled in the Call Manager service parameter, have enabled G.722 advertisement in the Enterprise Parameters, and have phones that are allowed to advertise G.722 - then you will find that two G722-capable phones that are talking to each other in a G.711 region will actually use G.722. Now, G.722 has the same bandwidth requirements that G.711 has. When this CODEC is specified and the inter-region Link Loss Type is set to “lossy” the iLBC CODEC is forced. This setting identifies the best quality (highest bandwidth) CODEC that can be negotiated. The CODEC setting for a region or inter-region communication does not specify the exact CODEC that will be chosen. From the CUCM/Region perspective, CODEC selection is derived from the intersection of CODECs supported by all entities involved in the media stream. This gets into that "choose the best" discussion I had in my original follow up. This assumes you decide to invest money into supporting the Counterpath product that you enjoy using and purchase the X-Lite pro.Īctually, you won't need to create a new region for G.722 CODEC, your G.711 regions will support this (assuming you have CM service params and enterprise params set to the defaults). Not sure how this plays with X-Lite as a client, but it may mean you will need to set a preference on CODEC choices. Probably you havent allowed extension to register outside of LAN (default setting) or you managed to block the IP address of the phone. Also, with respect to SIP trunks, CUCM relies on the CODEC preferences in the SDP provided by the SIP-UA. There are no issue of registering 3rd party SIP devices, including X-lite with 3CX. It doesn't have an immediate impact on your scenario, but it is something to keep in mind. It is a subtle difference, but a difference nonetheless. Keep in mind that when CUCM refers to the audio CODEC they really mean the "best CODEC" not the "only CODEC supported". You only other alternative is to put X-Lite in a special device pool which has a special region that allows inter-region use of the G.711 CODEC. If you go with the X-Lite pro, you can get the G.729 CODEC supported in the client and then you should be able complete your calls successfully. In other words, your calls are failing for the reasons you have already identified. Because you have configured your inter-region voice CODEC to use G.729, the phones in the different regions will be unable to stand up the media stream.
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