[asterisk-bugs] [Asterisk 0019196]: Can't provide secure audio requested in SDP offer

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=19196 
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Reported By:                stefanero
Assigned To:                
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Project:                    Asterisk
Issue ID:                   19196
Category:                   Channels/chan_sip/SRTP
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.8.3.2 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2011-04-28 08:29 CDT
Last Modified:              2011-04-28 09:55 CDT
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Summary:                    Can't provide secure audio requested in SDP offer
Description: 
Hello,

I am running * version 1.8.3.2 on opensuse 11.3 x86_64

we have a lot of Voice over WLan phones attached to our * , which use * as
a generic gateway to our Nortel CS1KE (rel 5.5).

I wanted to upgrade from * 1.6.0.24 to latest 1.8.X version.

when now calling from SIP phone to Nortel everything is okey, all calls
work no problem.

but when I want to transfer an existing wlan-nortel call to a 2nd nortel
phone I get an error in the asterisk console.
also the RTP stream is dead on both ends, and noone can hear the other.
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 (0134236) stefanero (reporter) - 2011-04-28 09:55
 https://issues.asterisk.org/view.php?id=19196#c134236 
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Well can I prevent asterisk from offering crypto?
apperently the Nortel supports both srtp and rtp, our current asterisk
(1.6) does not offer srtp and therefor it gets ignored maybe?

I do get a warning in 1.6 
chan_sip.c:7183 process_sdp: Unsupported SDP media type in offer: audio
5216 RTP/SAVP 8 0 18 101 111

but here asterisk and nortel can communicate in the end fine. 

I am wondering how I can tweak 1.8 asterisk to behave like 1.6,
or did 1.6 also behave wrong here?!

thnx for the help
stefanero 

Issue History 
Date Modified    Username       Field                    Change               
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2011-04-28 09:55 stefanero      Note Added: 0134236                          
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