The SIP Trunk as well as the CUE are in the same region supporting only G.711. On the SIP Trunk I've tried all different kind of DTMF configurations (No Preference, RFC 2833 and OOB). We've tried to force the GenBand SBC to only use RFC 2833 as well as the SIP Trunk. But this didn't work, not even after we added a MRGL with MTP's.
Is there some sort of best practive to implement DTMF over a SIP Trunk? Is there a way I can do some debugging on the CUCM/CUE?
Here is some aditional information from the ISP side. We are using a Genband MSX release 4.3m6 and we have the following options for DTMF transmission:
RFC2833 (payload type 101)
When we send DTMF to the CCM with SIP NOTIFY we see a 403 Forbidden comming back from the CCM.
One other thing i noticed is that when we place a inbound call to the CCM --> IVR (using RFC2833) the 200OK doesen't contain a media type 101 (rfc2833), and if i'm correct the CCM was configured for RFC2833 at that point. If the SBC doesen't receive the correct media type in the 200OK it assumes that there is no support for RFC2833 and it will fallback to inband DTMF tones in the audio stream.
Could this have something to do with the DTMF transmission between the CCM and unity express? Is the DTMF transmitted in the siggnaling between the CCM and the unity express? Or is it using RTP payload like RFC2833 does?
Now here's the next challange.. SIP Trunk is in a region running G.711. IP Phone A and B are using G.711, IP Phone C and D are using G.729. All devices have a MRGL containing both MTP (G.711) and CFB (G.711). Setting up a conf call to the G.711 phones is working fine. But when I try to setup a conf call to phone A and B, or A and C. The G.729 call gets terminated. It should use the CFB and MTP just as it whould with a normal H.323 or MGCP gateway connected, right?
Sorry, nevermind my previous posting. I need hardware transcoder to get this to work..
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
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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 ...
This document describe how DST changes and how time changes are
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