I have two sites connected with gateway controlled interculster trunks. I configured the trunks so that calls between them would be g729. For some reason the phones get sent to my IOS transcoder (NM-HDV-FARM) instead of just using their own DSP's. I have plenty of transcoders so that's OK. However, the process is so slow that the calling party never hears the called party say "Hello". The call gets setup well ahead of the RTP stream. Their is some skinny protocol activity during the delay but I don't have voice sniffer to decode it. My gateway is running 12.2(15)T1 and my CallManagers are at 3.3(2)spC. None of the equipment is over 5% utilized.
I am using the voice rtp send-recv command. Once the RTP stream starts everything seems OK. It does seem to be the interaction between CM and the DSP resource that is taking so much time. At first I suspected some network problem like slow ARP responses or weird routing, but my sniff shows that part is working fine.
Do you have the option of reconfiguring for testing purposes so that the call between the two sites uses G711 in order to obviate the need for transcoding resources? If so, what is the result of the test call?
I finally got this resolved. As everyone suspected the problem was not the transcoding. Instead it had something to do with Media Termination Points. I had the 'requires MTP' box checked on the trunk configuration. As soon as I unchecked MTP the delay went away. As a test I checked 'requires MTP' on one of my H323 gateway configurations and received the same results. Any theories on that?
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If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...
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