[asterisk-bugs] [Asterisk 0018674]: [patch] Unable to choose which SRTP suite to offer

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18674 
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Reported By:                bbeers
Assigned To:                
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Project:                    Asterisk
Issue ID:                   18674
Category:                   Channels/chan_sip/SRTP
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           SVN 
JIRA:                       SWP-3142 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases):  trunk 
SVN Revision (number only!): 303637 
Request Review:              
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Date Submitted:             2011-01-25 09:56 CST
Last Modified:              2011-04-20 05:08 CDT
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Summary:                    [patch] Unable to choose which SRTP suite to offer
Description: 
Setting encryption=yes in sip.conf will cause asterisk to
 generate a line in SIP INVITE SDP:

 a=crypto: AES_CM_128_HMAC_SHA1_80 ...

There is no way to specify that asterisk should offer
 AES_CM_128_HMAC_SHA1_32 instead of
 AES_CM_128_HMAC_SHA1_80.

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Relationships       ID      Summary
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has duplicate       0018893 Can't provide secure audio requested in...
related to          0018187 Indicate SRTP + Feature reqest
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 (0133976) keys (reporter) - 2011-04-20 05:08
 https://issues.asterisk.org/view.php?id=18674#c133976 
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bbeers: any updates?

FYI your patches do not affect IAX2 encryption.
The unprotect errors that you say are related to libsrtp functions, do
they in any way mean that there is a fallback to standard RTP during a
call, or at the start of a call?

Using Wireshark everything looks correct with srtp packets but of course
its harder to tell when TLS is also enabled. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-04-20 05:08 keys           Note Added: 0133976                          
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