[SIPForum-discussion] SIP Faxing

[Rohan Almeida]

15% failure is too high. 2-10 % is on an average is acceptable.
but again the fault might not be only in your system. the interconnect
devices might also be the cause.

On Tue, Aug 9, 2011 at 9:52 AM, Greg Settle <gsettle at opentext.com> wrote:

> What is the topology?
>
> SIP trunk - SBC/gateway - fax server?  If yes, who is the SIP trunk
> provider?  Do they support T.38 FoIP?
> T1/PRI - gateway - fax server?  If yes, which gateway(s) is involved?
> Support for T.38?
>
> Assuming a fax server is involved?  If yes, which fax server?
>
> Generally, if T.38 FoIP is supported among all endpoints, and proper
> testing was done to verify configuration among the components, SIP
> faxing failure rates should remain low.  15% failure rate is high, and
> points to weak links in the topology where FoIP standards (T.38) are not
> being met.  Attached is a document which may assist.
> Greg
>
> -----Original Message-----
> From: discussion-bounces at sipforum.org
> [mailto:discussion-bounces at sipforum.org] On Behalf Of Steve Underwood
> Sent: Monday, August 08, 2011 9:47 AM
> To: discussion at sipforum.org
> Subject: Re: [SIPForum-discussion] SIP Faxing
>
> On 08/04/2011 09:40 PM, Melissa Parsons wrote:
> >
> > Hello,
> >
> > Can anyone tell me what an acceptable failure rate would be when
> > faxing over SIP? Currently we are averaging around 15%. This number is
>
> > high I would expect it to be somewhat higher than traditional faxing
> > but not this high.
> >
> > Thank you,
> >
> > *Melissa Parsons*|Enterprise Systems Engineer
> >
> > *MarineMax, Inc.* ( 727.531.1700 office | (727.524-3954 fax
> >
> > 18167 US Hwy. 19 N. Clearwater, Florida 33764
> >
> >
> That's vague. Are you using A-law or u-law? Are you using G.726? Are you
>
> using T.38? Pretty much anything else you might use will give 0 success
> rate, so I assume its one of those. The failure rate you get will depend
>
> on many factors. A high packet loss rate is a disaster for FAX. High
> jitter levels for the packet delivery time can be too. T.38
> implementations are quite variable in their behaviour, and not always
> that compatible. Many quirks in the SIP signalling arrangements exist in
>
> various implementations, too. At the end of the day you'll get somewhere
>
> between 0 and 100% success, depending on all these factors. Between
> servers in large data centres, connected straight on to the internet's
> backbone you might be able to send FAXes all week without an error. In
> really bad tributaries of the internet you might get a near 100% failure
>
> rate.
>
> Regards,
> Steve
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