[cisco-voip] refining dial peers for Fax

[Anthony Holloway]

/squints eyes
Not sure if sarcasm, or helpful.

On Tue, May 8, 2018 at 12:48 PM Brian Meade <bmeade90 at vt.edu> wrote:

> I like to limit down to 9600.  That seems to work out much better.
>
> On Tue, May 8, 2018 at 12:54 PM, Anthony Holloway <
> avholloway+cisco-voip at gmail.com> wrote:
>
>> What's the explanation for setting the fax machine itself to 14400, or
>> the dial-peer for that matter, when for the most part SG3 is not supported,
>> and SG3 gets spoofed down to G3, and the command "fax rate voice", which is
>> the default, already caps at 14400?
>>
>> I might have explained that poorly, but basically, I see 14400 speeds all
>> the time, and I don't change the fax rate command nor set the speed on the
>> machine.
>>
>> I'm not challenging what you're saying, just trying to understand it.
>> Fax has been a pain for me, just like everyone else, so the more I know,
>> the better I can deal with it.
>>
>> I do like to avoid unnecessary config when possible, but in this case, I
>> just don't know if there is proven evidence, that you need to do these two
>> things.
>>
>> On Tue, May 8, 2018 at 11:35 AM Ryan Huff <ryanhuff at outlook.com> wrote:
>>
>>> Set the TX/RX rate at 14400 kbps and turn ECM. I would do that at the
>>> machine level first, and/or the dial-peer level second.
>>>
>>> Sent from my iPhone
>>>
>>> On May 8, 2018, at 12:17, Jonatan Quezada <jonatan.quezada at chemeketa.edu>
>>> wrote:
>>>
>>> we are finding that after our sip cutover, that our faxes are happiest
>>> signalling over a T1 connection that originally we were trying to get away
>>> from, however trouble shooting was terrible and we are moving past having
>>> all voice traffic on the SIP trunk.
>>>
>>> Currently we are signalling for voice( calls ) only on the trunk and fax
>>> traffic can come in and out via that T1.
>>>
>>> My question is , still every so often we are seeing fax drops and
>>> incomplete page transmissions.
>>>
>>> looking at the controller the interface is solid no slips and seems to
>>> negotiate the connections just fine. but again every so often there are
>>> drops or sending fails altogether.
>>>
>>> We are wanting to try limiting the transmission rates but on the ATA190
>>> and 191s you cannot rate limit on the device. It sounds like this needs to
>>> done at the dial peer level. if so what is the best starting configuration
>>> for the dial peers that will handle on ly fax and go out a certain gateway
>>> that has the T1 on it?
>>>
>>>
>>> https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-border-element/115742-fax-modem-call-flows-00.html
>>>
>>> Im looking at this call flow
>>>
>>> Telco - PRI - GW - MGCP - CUCM - SIP - ATA187 - Fax/Modem
>>> <https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-border-element/115742-fax-modem-call-flows-00.html#anc7>
>>>
>>> except the ATAs are 190 and 191s
>>>
>>> If we go the dial peer route, since the DID are not contiguous I will
>>> need a dial peer for each one huh?
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
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>>> 5033997899 <(503)%20399-7899>
>>> -or-
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>>> <https://dashboard.chemeketa.edu/helpcenter/default.aspx>*
>>>
>>>
>>> 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>
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>>
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