Refer to Section 5.3.3.3 in 3GPP TS 26.234

alt             = "a" "=" "alt" ":" alt-id ":" SDP-line CRLF
SDP-line        = <type>=<value> ; See RFC 2327
alt-id  = 1*DIGIT  ; unique identifier for the alternative in whole SDP.


To be able to assign an alternative ID to the default alternative, the
following identification attribute is defined.
 
alt-default-id  = "a" "=" "alt-default-id" ":" alt-id CRLF

The doc can be found at
http://www.3gpp.org/ftp/tsg_sa/WG4_CODEC/TSGS4_28/Docs/S4-030680.zip

I hope this helps.

Regards,
Gaurav

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bin Chen
Sent: Friday, November 24, 2006 11:23 AM
To: [email protected]
Subject: [Sip-implementors] SDP attribute meaning

Hi,

How can I found this SDP media attribute's info?
a=alt:1 1 : Wuy71 xax LRZQ9k3k 192.168.0.124 20610

Thanks.
Binary Chen

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