[cisco-voip] refining dial peers for Fax

['Jonatan Quezada']

turn off ECM right?

and I feel like this configuration works best for passthrough correct?

when would one go to T38?

can it go T38 with this type of 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 our ATA s are 190 and 191s

On Tue, May 8, 2018 at 9:35 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?
>
>
>
>
>
>
>
>
> --
> For immediate assistance please reach out to Chemeketa IT Help Desk at
> 5033997899
> -or-
> Visit the help center from your employee dashboard found here:
> *https://dashboard.chemeketa.edu/helpcenter/default.aspx
> <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
> Mobile 9712182110
> SIP 5035406686
>
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-- 
For immediate assistance please reach out to Chemeketa IT Help Desk at
5033997899
-or-
Visit the help center from your employee dashboard found here:
*https://dashboard.chemeketa.edu/helpcenter/default.aspx
<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
Mobile 9712182110
SIP 5035406686
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