CS1K H.323 trunks talking to SIP trunks

[norteltech91]

I have a customer who has a new Cs1K with SIP trunks back to an option 81C and they work fine - the option 81C has 4 other sites tied to it all using H.323 trunks we cannot seem to get the calls to pass from the SIP to the H.323 to reach the far end any suggestions would be great.

 

[pronei]

Yes, in NRS, you have to set all the gateway endpoints to tandem calls through your 81c that has the SIP & H323 trunks.

 

[norteltech91]

Thanks I will go in and look at this

 

[tnphoneman]

SIP and H.323 will not talk directly. They are different protocols. Like Pronei says you need to make all the calls flow through the 81c. Check your NCOS level on the SIP trunks and make sure they are high enough to make the CDP call type. If you have TGAR set to yes then make sure the TGAR on the trunks and TARG on the route do not match. Check your prompts in your NET_DATA block in ld 15 and make sure they are correct. If the trunks are passing the NCOS and TGAR that may be the issue, so some call traces

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[allenmac]

Instead of changing all of your endpoints to Tandem through the Option 81, you can add the option 81 as a default route for your CDP and/or UDP calls. This will cause only the calls that need to go between SIP & H.323 to use the 81.

When you use the Tandem setting, you are forcing the call through the Tandem endpoint whether or not it really needs to use it.

For example, look at the Option 81c already networked with 4 H.323 endpoints. If you mark everything to tandem through the Option 81c, then all calls, even between the 4 H.323 endpoints will always route through the 81c, instead of routing directly to each other. The only time you really need to involve the 81c is when you are 'transcoding' between SIP and H.323 signaling.



In every class I have been in, the Tandem field was only used for Branch Office and Remote Office applications.