09-28-2010 09:36 AM - edited 03-16-2019 01:03 AM
Hello.
We have this scenario:
IPPhone-(SCCP)-CallManager-(SIP)-PGW-(MGCP)-AS53XX-[PRI]-PSTN
When we make an outgoing call, for example, to a mobile phone that is turned off, we can't hear the "Early Media" message which informs that the call will be forwarded to the voice mail. We only hear the actual voice mail greeting.
What's wrong?
Best regards.
Solved! Go to Solution.
10-05-2010 09:58 AM
Hard to tell from this little info but all portions must support early media (they should here)
and PRACK should be enabled in CUCM:
With early media cut through, a greeting gets played to the caller before the called party is alerted about the call. Trunks and gateways must support early media cut through for the greeting to get played in such a way. Cisco PRI/MGCP gateways, H.323 gateways and trunks support early media cut through. For SIP trunk to support early media cut through, you must enable PRACK. Be aware that a greeting may not get played if the device does not support early media cut through.
10-05-2010 09:58 AM
Hard to tell from this little info but all portions must support early media (they should here)
and PRACK should be enabled in CUCM:
With early media cut through, a greeting gets played to the caller before the called party is alerted about the call. Trunks and gateways must support early media cut through for the greeting to get played in such a way. Cisco PRI/MGCP gateways, H.323 gateways and trunks support early media cut through. For SIP trunk to support early media cut through, you must enable PRACK. Be aware that a greeting may not get played if the device does not support early media cut through.
10-05-2010 11:27 AM
In addition to seting the SIP service parameters up, keep in mind that an MTP needs to be invoked to do Early Media on the SIP trunk.
- The 'Media Termination Point Required' checkbox on the SIP trunk config on CUCM has to be checked.
- Ensure that the MRGL on the SIP Trunk has access to an MTP
- Ensure that the region settings between the SIP trunk and MTP, and MTP and phone are set properly
- Reset the SIP trunk from CUCM admin, if you made any changes on the config page
You can test again and check if there's any difference in the call flow.
- Sriram
10-08-2010 01:13 AM
Dear crieman,
we have solved the problem.
We have made the following changes on the settings:
It hasn’t been necessary neither to reset the SIP trunk nor to activate the MTP.
Regards.
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