ATA 187 Fax is failing with CUCM 8.6 & 2951 CUBE Gateway.

[sarwarm123]

Dear All,

Here is the call flow for failed fax :

ATA 187---------- CUCM 8.5 ----------2951 SIP CUBE------------ITSP

We have SIP link and a CUBE router, everything is working fine apart from the fax. Can someone please give me some sample config

[layhlaing]

Hi,

You can just add ATA as a device/phone in CUCM and use the existing dial-peers for other phones.

Fax Mode  "Fax pass-through" worked perfect for me on both ways and I needed to have

!

voice service voip

fax protocol pass-through g711ulaw

!

Cheers,

[Jorge Armijo]

First of all, you need to clarify what faxing protocol is your ITSP supporting, Pass-Through or T.38.

If T.38:

CUBE Dial-peers:

dial-peer voice 1 voip

  fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through

  fax-relay ecm disable

  fax nsf 000000

  fax-relay sg3-to-g3

Configure ATA to t.38

If Pass-Through:

CUBE Dial-peers:

dial-peer voice 1 voip

  fax protocol pass-through g711ulaw

Configure ATA to Passthorugh.

Please make sure MTP is not allocated for fax transmition, it will break it.

HTH

--
Jorge Armijo

Please remember to rate helpful responses and identify helpful or correct answers.

[sarwarm123]

Hi Jorge,

Thanks dear I will apply this settings and will let you know, how did that go? Also, I will check first with ITSP what protocol they support?

[sarwarm123]

Hi Jorge,

Please see below response of the ITSP, can you please suggest do I need amendment in the above script?

Just checked with ITSP and they support:

• G711 pass-through for 'in-band' transmission.
• T.38 relay, within which either party issues a SIP re-INVITE with T.38, upon the detection of fax tones.

[Jorge Armijo · Accepted solution]

Well, I would say, if they support t.38, then use it:

dial-peer voice 1 voip

  fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through

  fax-relay ecm disable

  fax nsf 000000

  fax-relay sg3-to-g3

Configure ATA to t.38

HTH

--
Jorge Armijo

Please remember to rate helpful responses and identify helpful or correct answers.

[Jorge Armijo]

sarwarm123

Were you able to get this working?

--
Jorge Armijo

Please remember to rate helpful responses and identify helpful or correct answers.

[sarwarm123]

Hi Jorge,

Actually change should go through the change board, so plan is to apply change tomorrow, finger cross

One again thanks for your help, I will update you tomorrow how did this go.

[Jorge Armijo]

Sounds good, let us know how it goes.

--
Jorge Armijo

Please remember to rate helpful responses and identify helpful or correct answers.

[Jorge Armijo]

sarwarm123

Any luck?

--
Jorge Armijo

Please remember to rate helpful responses and identify helpful or correct answers.

[sarwarm123]

Hi Jorge,

Sorry for replying you bit late, just want to thanks to you for your help. All working fine

[maheshgunaratne]

Hi all,

I have issue with internal fax (extension to extension) I configured SPA122 as anlog adapter and im able ring between fax machine. when try to send disconnected after ringing. i tried  both ways using extension numbers but no luck.

fax -->spa122-->cucm8.6-->spa122-->fax

cucm version is 8.6

first I need to setup internal fax and then I want to try for external fax.

any suggestion to correct my mistakes.

thanks,