New SIP trunk, can't hear called number ring, everything else fine

Unanswered Question
Dec 29th, 2008
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We are in the process of testing a new SIP trunk.


The Gateway is configured IP2IP Gateway.


The insbound and outbound calling seems to be working fine, but when I dial an outside number, I do not hear the remote end ring.


When the remote end picks up, I hear everything fine.


Inbound calling seems to work fine.


Would this be a carrier issue, or Gateway config?


Is there a way for me to debug the Gateway and determine where the issue is?

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Nicholas Matthews Mon, 12/29/2008 - 09:23
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Hi Wilson,


There are few things you can do to try to fix this problem. There aren't any details, so this is speculation:


voice service voip

h323

emptycapability

sip

midcall-signaling


On CUCM:

If H323 gateway:

Check 'MTP required'

Uncheck 'wait for far-end H245'

Enable outbound fast-start

Enable inbound fast-start


If SIP gateway:

Check 'MTP required'



What is probably happening is you're doing slow start or late media out, and your provider is sending in-band ringback. They should be sending a 180 Ringing, or we will need to send early media. That's what this configuration should help with.



hth,

nick

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