CME with SIP Trunk and T.38 Fax Server

Answered Question
Jan 20th, 2010

I have an operational CME with a SIP Trunk to a SIP Provider. The SIP Provider uses T.38 for FoIP.

Now I would like to route one of the DDI numbers to a Fax Server that supports both H.323 and SIP with T.38.

1. Is this feasible at all?

2. Would you use H.323 or SIP with the Fax Server?

3. What is the necessary configuration on the CME?

Your help is greatly appreciated

/David

I have this problem too.
0 votes
Correct Answer by Vladimir Savostin about 6 years 10 months ago

Hello David,

1. Is this feasible at all?

Yes

2. Would you use H.323 or SIP with the Fax Server?

If FAX Server supports both H323 and SIP it does not matter which one to use.

There are some limitations for SIP-H323 and SIP-SIP calls though, you can check CUBE config guide for details:

http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb_book/vb_book.html

3. What is the necessary configuration on the CME?

First of all you will need IOS with -ivs prefix for CUBE(IPIPGW) fatures to work.

Then configure your GW to support IP-to-IP calls and T.38 FAX protocol:

voice service voip

allow-connections sip to h323
allow-connections sip to sip

fax protocol t38

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Correct Answer
Vladimir Savostin Mon, 01/25/2010 - 06:12

Hello David,

1. Is this feasible at all?

Yes

2. Would you use H.323 or SIP with the Fax Server?

If FAX Server supports both H323 and SIP it does not matter which one to use.

There are some limitations for SIP-H323 and SIP-SIP calls though, you can check CUBE config guide for details:

http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb_book/vb_book.html

3. What is the necessary configuration on the CME?

First of all you will need IOS with -ivs prefix for CUBE(IPIPGW) fatures to work.

Then configure your GW to support IP-to-IP calls and T.38 FAX protocol:

voice service voip

allow-connections sip to h323
allow-connections sip to sip

fax protocol t38

d.haeni Mon, 01/25/2010 - 07:08

Vladimir - exactly what I was after!

Thank you very much!

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