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New Member

Whether can support FAX rate 31200

i have belowing scenario:

FAX--vg224---<SCCP>---CCM---<MGCP>---ISR

Due to use's fax can support 31200, can this topology can support fax relay to 31200?

I use T38 fax relay

2 REPLIES
New Member

Re: Whether can support FAX rate 31200

Hi Zhang

T.38 only supports Fax at G3 speeds. But you could use the "fax-relay sg3-to-g3" command to tell the fax machines to train down to G3 speeds.

For SG3 speeds you need to configure "modem pass-through".

Check out the follwing links for further information:

http://www.cisco.com/en/US/docs/ios/12_4t/12_4t4/sg3spoof.html

http://www.cisco.com/en/US/docs/ios/voice/fax/configuration/guide/12_4t/vf_12_4t_book.html

Regards

Stefan

New Member

Re: Whether can support FAX rate 31200

Thanks Stefan, 5 points

Through 'sh mgcp' on ISR, i found 'fax-relay sg3-to-g3' is enable by default.

According to my current configuration, the user's fax machine can train down to 9600 speed. Whereas user hope our ISR can support 31200 speed which can be supported by their fax machines

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