In our lab we have a UC520 connected via a sip trunk to an IP PBX (Selta SamIP). All is working fine but the call forwarding to voicemail from internal phone extensions. The calls received from the outisde, passing through the PBX, are forwarded correctly to the voicemail, as well as calls from the ip phones registered to the UC. The issue arises only when the call is made by a phone registered to the pbx, thus using only the extensions: as soon as the call is forwarded to the cue we receive a fast busy tone. Attached the conf.
We have a transcoder configured actually, anyway I'm going to check it.
The issue arises only when a phone belonging to the PBX tries to reach the voicemail. All the calls from the PSTN end correctly to the voicemail and they have to change the codec from g711a to g711u as well. The same for the calls among phones registered to the UC. It doesn't seem to be a problem related to transcoding; please correct me if I'm wrong.
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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 ...