[cisco-voip] VG224 with Fax Machine going out Verzon Business SIP trunk via CUBE

[Jason Aarons (US)]

In general with VZ Buisness SIP  Trunk is a MTP resource required for
every call? So planning for 80 calls means you should have 80 MTP
resources avail?  We noticed without MTP resources we can't transfer
calls.  Using CallManager 7.0(2) and UCCX 7.0(1)SR1.

 

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note0
9186a00808b6ca6.shtml

 

 

From: cmstaffin at gmail.com [mailto:cmstaffin at gmail.com] On Behalf Of
Craig Staffin
Sent: Tuesday, May 26, 2009 5:34 PM
To: Jason Aarons (US)
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] VG224 with Fax Machine going out Verzon
Business SIP trunk via CUBE

 

Jason,

So far in my experience with VZ business SIP has not been the best with
faxing.
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.

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.

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.

Post back once you have some debugs as I have gotten far to familar with
troubleshooting verizon SIP issues :)

Craig



On Tue, May 26, 2009 at 2:52 PM, Jason Aarons (US)
<jason.aarons at us.didata.com> wrote:

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.

 

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