I have a very simple scenario. I have one 3845 router and CUCM 7.x. I have taken SIP trunk from our local ITSP. The calls will be coming using g.711 codec. Now i have 20 branches, all of them using g.729 over WAN and our HO (where 3845 with sip trunk from ITSP is placed) is using g.711 codec on LAN. As you can see, so far its very simple. I want to ask, that if a call comes from outside (over SIP trunk) to any branch extension(which is using g.729), is transcoding required ? since call is coming from g.711 and going for g.729 extension !!
If your SIP propvider also offers g729 in the invite, then it will just connect the call as g729 straight through all the way from the phone to the provider.
If your trunk *only* does 711, and you're doing g729 only to your phones, then you'd have a codec mismatch at CUCM and would need a transcoder registered to CUCM. Anytime you have to change codecs in the middle of the call, you need a transcoder at the point where the codec mismatch occurs.
Also, note that CUE doesn't support g729. You need to do g711 to CUE, so if you force g729 on your phones you need a transcoder for any call from those phones to VM.
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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 ...