[Spce-user] Fax problem

[Matthew Ogden]

Hi Abel

Unless you have Guaranteed 0% packet loss (like a LAN speed connection or
direct ptp link). Then using pass through is going to give you constant
hassles in my experience.

Most likely what is causing the issue is that your server is just creating
a greater degree of packet loss and jitter.  Faxes really don't deal with
either very well.

Kind regards
Matthew
On 15 Jan 2014 7:17 PM, "Abel Alejandro" <
aalejandro at alliedtechnologygrouppr.com> wrote:

> Hello,
>
> I have some fax issues and I am not sure how to find the problem.
>
> My test topology looks like this:
>
> ATA -> Sipwise -> My carrier -> PSTN
>
> In this setup fax calls usually do not work, they work like 2 out of 12.
>
> However if I request my carrier to provide an account for the ATA and
> change the topology to:
>
> ATA -> My carrier -> PSTN
>
> Then calls work without issue.
>
> My sipwise is on a HP server without virtualization, and the cpu idle does
> not go below 90%. I do not have more than 10 concurrent calls so there is
> no traffic issue.
>
> Codec is g711, pass thru is enabled (not using t.38).
>
> Running tcpdump on the sipserver and analyzing the capture with wireshark
> only shows about 0.01% pkt loss due to jitter. However the tcpdumps always
> have packet drops due to kernel, not sure if this is normal.
>
> Any tips?
>
> --
> *Abel Alejandro*
>
> 787 586 8313 | 787 705 0555
>  <joquendo at alliedtechnologygrouppr.com>
>
>
> 400 Calle Calaf 477
> San Juan, PR 00918
> aalejandro at alliedtechnologygrouppr.com
>
> _______________________________________________
> Spce-user mailing list
> Spce-user at lists.sipwise.com
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>
>
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