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"H.323 Annex E".

ciscoforum
Level 1
Level 1

‎08-16-2007 06:34 AM - edited ‎03-14-2019 11:06 PM

Has anybody known where Cisco uses "H.323 Annex E". Recently there is a psirt announced on the following link

http://www.cisco.com/warp/public/707/cisco-sa-20070808-IOS-voice.shtml

one of the vulnerability is attacked on "H.323 Annex E" which is udp 2517. But I never seen this being used in Cisco world. Anybody knows this? Thanks

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gogasca
Level 10
Level 10

‎08-16-2007 09:13 PM

H.323 Annex E - Faster Connection Method

This Annex specifies the optional use of UDP instead of TCP, and the optional use of fixed-format packet encoding instead of the

more processor-intensive ASN.1 encoding.

It is supported from 12.2(11)T.

conf t

voice service voip

h323

session transport udp

For restrictions refer this,

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087b94.html#1019345

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ciscoforum
Level 1
Level 1
In response to gogasca

‎08-17-2007 07:35 AM

Thanks. I know that by default it uses tcp 1720. So when we configure it as udp, it will use udp port 2517?

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gogasca
Level 10
Level 10
In response to ciscoforum

‎08-18-2007 07:41 PM

YEs

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