[cisco-voip] Speed up skinny?

[Keith Klevenski]

Is there any mechanism to 'speed up' skinny call setup like faststart in h323?  Satellite provider migrated to skinny gateways (SCCP controlled FXS ports) from h323 gateways.  All analog phones.  It was noticed that inbound PSTN calls (through h323 gateway) were losing the first second or so of the call when the called party picked up.  This made sense to me as the skinny gateway must tell CM the phone has gone offhook then CM tells the gateway to tell the phone to stop ringing and send media stream to the PSTN gateway.  This is over a 600-700ms satellite link so the delay would be reasonable.  The rest of the call is perfect.  If the same skinny gateway is changed to h323 the delay is not present since h323 gets the IP address where to send the stream during call setup if I'm not mistaken so the delay isn't present, but neither are the features of skinny controlled fxs ports...

To me this is all reasonable and makes perfect sense.  The question the customer has is if there is any mechanism to speed up the skinny signaling.  I wouldn't think so based on the master/slave nature of the skinny protocol.  I've configured voice call send-alert, voice rtp send-recv, progress_ind setup enable 3, and all that, but nothing helps and I can understand why.

Can anyone confirm if there is a way to speed up skinny call setup over high latency links?  Running CM 7.0, SCCP controlled FXS.

Thanks!

-Keith
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20090803/ccf766e6/attachment.html>