I have an issue where there is a CUBE(h323-sip) with a CCM 4.2 cluster setup. In Call Manager h.323 fast start is enabled outbound to the gateway with g729 set as the outbound codec, this was recently changed so that SDP is sent in the initial INVITE messages.
However, this configuration broke the way faxing is currently configured. In this setup, to send a fax, a user prefixes the dialed string with an 8. The gateway will use the 8 to match dial peer 300 and strip off the 8 before sending the call. However, since enabling fast-start, dial-peer 300 doesnt match since as it is set for g.711 and CCM sends g.729 in h.323 fast start.
I want to still be able to use fast start and g.729 codec for regular calls, but need to get faxes working again across the dialpeer 300. Thoughts?
One item you may want to try is to configure a voice-class codec and set the first preferred codec to 729r8 with the second being G711U, then apply the voice class codec to the indbound voip dial-peer vs setting a single codec for the dial-peer.
ata 186.. Yeah I was think it may be the ATA. The other end of the SIP side is not Cisco, so it will not support the cisco proprietary method of faxing.
The whole issue of going to fast start in the first place is so that they could get an earlier media cut-through on voice calls (they were missing some messages such as "This number has been disconnected as dialed")
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