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Jason,<br>
<br>
Thanks for sharing.<br>
<br>
Some inspection devices do not like half duplex streams. MoH is
inherently an Rx only stream, there is no real reason for a Tx
stream. With Rx only CM only signals audio in one direction. Some
inspection devices view this negatively. The service parameter has
CM signal over the network to open a bidirectional stream even
though the Tx stream is not used. RTP fully allows half duplex.
Some products and individuals just get a bit over zealous in
inspection.<br>
<br>
Regards,<br>
Wes<br>
<br>
On 4/28/2011 10:22 AM, Jason Aarons (AM) wrote:
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">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. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif";"><o:p> </o:p></span></p>
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<br>
<br>
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