I get "unreliable" results with g711ulaw trunking. Ive used several providers. One (or 2, 3 page) faxes seem to be fine. Large faxes ALWAYS seem to fail.
POTS to the ATA is pretty reliable since the jitter and latency is internal. Faxes over a siptrunk are completely different, especially if you need to send multiple pages. It will always be unreliable in g711ulaw (as in trunking, how unreliable is different on a daily basis IMO. The whole reason t.38 was developed was to get around the KNOWN issue with g711u and make Internet faxing reliable. I can fax inbound to a lab 4.3.x system from POTS to PRI in front of sipx all day long without issue, because the PRI does t.38 and so does sipx. It only has to traverse 50 feet on t.38 with no latency to complete the fax. When this is done raw from a siptrunk, results are different, which is why t.38 needs to be available on your siptrunk provider (or a separate t.38 trunk needs to be made available for faxing). On Tue, Oct 26, 2010 at 12:04 PM, Michael Scheidell < [email protected]> wrote: > On 10/26/10 11:56 AM, Roman Gelfand wrote: > > I have a sipx sip trunking configuration. I have a network fax > machine. Can the two talk together to send or receive faxes. If not, > what would I need to have in between them to make it work? If yes, > > I have an older PAP ATA with two analog fax machines on it and am using > Level3 SIP Trunking. > I don't seem to have a problem faxing (I thought I should have a problem. > by all rights, but I don't) > > so, MAYBE, you put your network fax modem on an ATA, maybe it will work, > maybe it won't. > (our network fax is on a POTS line, and I can fax to and from the POTS to > the ATA's) > > > could you point me to instructions? > > Thanks in advance, > _______________________________________________ > sipx-users mailing [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-users/ > > > > -- > Michael Scheidell, CTO > o: 561-999-5000 > d: 561-948-2259 > ISN: 1259*1300 > > *| *SECNAP Network Security Corporation > > - Certified SNORT Integrator > - 2008-9 Hot Company Award Winner, World Executive Alliance > - Five-Star Partner Program 2009, VARBusiness > - Best in Email Security,2010: Network Products Guide > - King of Spam Filters, SC Magazine 2008 > > > ------------------------------ > > This email has been scanned and certified safe by SpammerTrap®. > For Information please see http://www.secnap.com/products/spammertrap/ > ------------------------------ > > > _______________________________________________ > sipx-users mailing list > [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-users/ > -- ====================== Tony Graziano, Manager Telephone: 434.984.8430 sip: [email protected] Fax: 434.326.5325 Email: [email protected] LAN/Telephony/Security and Control Systems Helpdesk: Telephone: 434.984.8426 sip: [email protected] Helpdesk Contract Customers: http://support.myitdepartment.net
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