We are experiencing voice cutoff with SIP trunk. the scenario is, when making outbound call from an IP phone to PSTN phone, CCM delivers through SIP trunk to GW, when far side answers the call, the first or two words are always missing.
However when we set up H323 trunk, and send the same call through H323 trunk to the same GW, no voice cutoff.
So there is definitely fine tuning in SIP, does anyone recommend something in SIP trunk (CCM) or sip (GW)? Thanks.
With the 183 session progress - with SDP info, this means that RINGBACK SHOULD BE PLAYED INBAND.
If the gateway gets an ALERT/PROGRESS with a PI value of 1,2,8 it will always send 183
In CCM Admin 'Service parameters'
Scroll down to:Clusterwide Parameters (Device - SIP)
Select "True" in the SIP Rel1XX Enabled.
This forces the 1XX messages sent by the gateway to Callmanager to be Provisionally ACK'd.
The PRACK sent by Callmanager contains the SDP necessary to open the audio
path from the gateway to the IP phone.
The PRACk message would force an audio path to be temporarily opened till we get a second set of SDP from the connect message. If the SDP is the same the session stays up and if not a new once is instantaneously opened with the negotiated parameters in the SDP.
The fix you suggested actually works, I asked on site people to try, and no voice cut off any more. However the way I test remotely is still with voice cutoff.
The way I use to test remotely is CTIOS mobile agent, so call into CCM, and CCM initiates outbound call, then bridge these two calls together. We used to verifying that inbound call has no cutoff, so it is likely something happening during the bridging.
We do have TAC case open, thanks for all the help.
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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
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 ...