FXS Port Config (Fax)

[spencermoore]

We're deploying 50 IP phones and a new 2921 gateway with an FXS card. I have all the phones configured, but need to add three analog fax machines to the gateway. These machines will be directly attached to the 2921 via FXS card. How can I configure this in CUCM? Steps I've taken:

1. Gateway>Module(slot1)>selected FXS

2. Configured port as loop start, assigned device pool, CSS and set "attendant DN" to last four digits of DID number (Telco providing 4 significant digits).

3. Set DN to same as "attendant DN" and assigned partition

Is this all their is to it? Is any additional configuration required? Unfortunately, I can't test yet as we are still on old gear. Trying to confirm the correct config prior to the cutover.

Edit: This is an MGCP gateway.

[Ryan Huff · Accepted solution]

Since you referenced gateway control on the port, I assume you are using MGCP (please do not use SCCP for faxing).

Typically, for MGCP, I use T.38 and these are the typical MGCP configs I use for T.38 on IOS with MGCP:

• no ccm-manager fax protocol cisco
• no mgcp fax t38 inhibit
• mgcp package-capability fxr-package
• mgcp default-package fxr-package
• no mgcp fax t38 ecm

Thanks,

Ryan

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[spencermoore]

Thanks! I'll add these to the GW. Have I setup everything correctly in CUCM as referenced above?

[Ryan Huff]

While it shouldn't hurt anything, you don't have to use the attendant DN field (it may be auto-filled in though -I can't recall), the DN field itself is sufficient.

Also, I would POTS on the FXS port, not Loop Start.

Thanks,

Ryan

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[spencermoore]

With loop start it is a required field. I'll try POTS. Thanks!