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Modem Passthrough

I have a 3661 running (H.323)12.4.4T with an NM-2V 2 FxS with a modem attached. I am calling a 2821 running (H.323) 12.4.4T with a PRI connecting to the PSTN. I have configured the following on the 3661:

modem passthrough nse codec g711ulaw redudancy.

I am unable to get the modem to connect on a regular basis.

I have turned off error correction, flow control, and auto speed on the modem. Looking for some guidance.

1 REPLY
Cisco Employee

Re: Modem Passthrough

Modem passthough is verysuseptible to the smallest hiccups, delay or jitter. The versions of IOS you are using here does support modem relay:

http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a00805138e7.html

You will probably get much better results with that. If you must use passthrough, use the show calla ctive voice command and check out the statistics for a call. Make sure QOS is everywhere.

Hope this helps.

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