[cisco-voip] Cube configuration for CenturyLink Sip Trunk

[Anthony Holloway]

If the carrier says they do pass through, then why even configure t38 at
all?  Just use the fax rate disable command on your dial-peers which forces
passthrough.

There is no difference in configuring your fax command globally versus the
dial-peer, however, there are some fax settings which you cannot set
globally that can only be set at the DP level.  E.g., Disabling NSF.

What codec(s) are you negotiating with the carrier for regular audio calls,
both inbound and outbound?  Some SIP trunks are a single codec, while
others can support multiple codecs.  I'd argue a SIP trunk to the PSTN
should never be g729 these days, as bandwidth is cheap enough, and then
subjectively you'd be supplying less than toll quality audio to your
customers and your employees, but I digress.

On Thu, Jan 11, 2018 at 11:51 AM Jonatan Quezada <
jonatan.quezada at chemeketa.edu> wrote:

> Hola Cisco Ninjas,
>
> We cut over to a CenturyLink IQ private SIP trunk, and we are seeing that
> FAXing is not functional like before. Part of the reason we feel is that
> the ATA and the fax devices location are the older ones, they are ATA186, I
> have tried
>
> The provider says they do passthrough, but we can only receive. We
> developed a workaround with a seperate routeList, and Group to use the T1's
> we migrated from.
>
> Has anyone successfully configured Fax with centuryLinkSip Trunk?
>
> The TAC team mentioned that I should use this command  in the dial peers
>
> fax protocol t38 nse ls-redundancy 0 hs-redundancy 0 fallback
> pass-through g711u’.
>
>
> before I mess with my dial peers I want to see if there are field tested
> methods that have been successful.
>
> What is the difference between configuring FAX globally on the voice
> service VoIP area of the configuration vs the dial peer side. I already
> have the above command configured globally. and fax is still receive only.
> I cant send out over the trunk.  thoughts concerns? ideas greatly
> appreciated
>
>
>
> Johnny Q
> Voice Technology Analyst - TelNet
> Chemeketa Community College
> Johnny.Q at chemeketa.edu
> Building 22 Room 131
> Work 5033995294 <(503)%20399-5294>
> Mobile 9712182110 <(971)%20218-2110>
> SIP 5035406686 <(503)%20540-6686>
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