Jason,<br><br>So far in my experience with VZ business SIP has not been the best with faxing.<br>They do allow fax pass-through however sometimes the CUBE router has problems switching from a G729 codec to G711 mid stream. However I can honestly say that I have never gotten faxes to work reliably over the verizon network.<br>
<br>The default for Verizon SIP is G729 and once fax tones are detected it will send a new INVITE message asking for G711 ONLY be aware of this as I ran into problems where the dial peer was only coded for G729 and this would lead to call silence on the call.<br>
<br>Some debug SIP messages would be useful to see if the call was detected as a fax call by the Nortel softswitches that verizon uses. If it was you should see a INVITE messages a few seconds into the call.<br><br>Post back once you have some debugs as I have gotten far to familar with troubleshooting verizon SIP issues :)<br>
<br>Craig<br>
<br><br><div class="gmail_quote">On Tue, May 26, 2009 at 2:52 PM, Jason Aarons (US) <span dir="ltr"><<a href="mailto:jason.aarons@us.didata.com">jason.aarons@us.didata.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p>Customer has a fax machine on VG224/SCCP/Modem Passthrugh
out CUBE 12.4/CallManager 7.0(2) running into Verizon Business SIP trunk. The
fax machines are having some issues (I can use analog phone to call out fine) and
I’m checking on modem passthrough with Verizon, but wonder if any else is
using Verizon Business for SIP trunk and what your faxing milage was? Did they
support G711 and modem-passthough, etc? Also checking QoS, etc.</p>
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