Anyone have a customer sending/receiving multi-page faxes over Verizon Business SIP trunk/g711 ?
Verizon Business indicates they don't support it, and I have 2 recent customers that it doesn't work for, and 1 current large customer telling me he's going to make it work <grin>.
The issues is the latency/jitter on fax/g711 over Verizon Business seems to spit out only 11 pages of a 15 page fax.
Anyone having faxing over PSTN SIP over G711 that is working 100% ? Any advice?
I would start looking into e-faxing if I were you.
When not using proper fax relay, nobody can guarantee anything.
"Fax and SIP Provider" is actually a hot topic. If there is no real PSTN in between you'll face all kind of interop problems.
(do the SIP providers use G711 end-to end? G.711 -> T.38? ...)
Here are some links with more insights:
http://www.sipforum.com/ (look for "SIP Forum FoIP Task Group Publishes Official Fax-over-IP Problem Statement")
BTW: even with PSTN you have less then 100%... :-)