CCM interop Nortel CS1K over H323/SIP

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Dec 13th, 2007
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Hi,

Lots of one way speech issue btw two when call hold/retrieve involved. Trace shows CCM sends RTP stream to the port not negotiated btw two in the second leg of call. Any idea? CCM version 5.1.2

Active Version: 5.1.2.3000-2



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smahbub Thu, 12/20/2007 - 15:19
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It looks like Codec problem, check the SCCP are up. Paste you're sh run and debug voice ccapi inout

andrewmair Fri, 12/21/2007 - 06:37
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It is because Cisco CCM use port 4000 in OLC and change the port in OLCAck. Why cisco is doing that? According to H245 , the port specify on OLC and OLCAck should be identical.

gogasca Fri, 12/21/2007 - 20:56
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"The port specify on OLC and OLCAck should be identical"

That is not necessarily true, OLC and OLC ack are different.

OLC is only use to tell the H323 GW to open a channel to initiate media transmission

OLC ack indicates to the other H323 the real IP and port that will be used for media negotiation

The TSAP Identifiers in OLC should not matter

the important one is TSAP Identifier for OLC ack.


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