[cisco-voip] Paetec SIP Trunk required Full Duplex Stream for Music on Hold to work

[Buchanan, James]

Actually this is a bug with 15.1. MOH to the PSTN fails unless you ether a) Disable ip cef on the gateway, or b) use Duplex Streaming.

James Buchanan | Technology Manager, UC | South Region | Presidio Networked Solutions
12 Cadillac Dr, Suite 130, Brentwood, TN 37027 | jbuchanan at presidio.com<mailto:jbuchanan at ctiusa.com>
D: 615-866-5729 | F: 615-866-5781 | www.presidio.com<http://www.presidio.com/>
CCIE #25863, Voice


From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jason Aarons (AM)
Sent: Thursday, April 28, 2011 9:22 AM
To: cisco-voip (cisco-voip at puck.nether.net)
Subject: [cisco-voip] Paetec SIP Trunk required Full Duplex Stream for Music on Hold to work

This does appear to be a Paetec SIP provider firewall issue that is fixed by setting "Full Duplex Stream" in CCMAdmin > Service Parameters > Advanced Parameters.

Paetec is delivering SIP service inside the MPLS cloud for multiple sites (each site has it's own CUBE 2951 15.1.3T1, no ip cef) running on centralized CallManager 7.1(5).

I toggled Full Duplex Stream to False and the far end doesn't get MoH. Set it to True and it works. Default is False.

Via CallManager packet capture we saw MoH to gateway, at gateway via Embedded Packet Capture we see exported .pcap file showing stream to Paetec IP and heard it playout via Wireshark. Already tried disabling ip cef earlier, but the Full Duplex Stream fixed it. So I'm guessing it's something with Paetec's firewall.


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