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List:       sip-implementors
Subject:    [Sip-implementors] [Removing m lines on session refresh, how much harm??]
From:       "Shida Schubert" <shida () ntt-at ! com>
Date:       2005-06-23 22:57:43
Message-ID: 200506232257.j5NMvYEZ017058 () secure03 ! dhserver ! net
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 Hi there;

 I know, it's not permitted to remove m-lines in
re-INVITE but what kind of impacts would you anticipate
if you remove m-lines which represents media stream that
is not in use(port no. set to zero). 

UA1            UA2
| m=audio:50000 |
| m=Video:50002 |
|-------------->|INI-INVITE
|               |
| m=audio:55000 |
| m=Video:0     |
|<--------------|
|               |
| m=audio:50000 |
|-------------->|re-INVITE
|               |
| m=audio:55000 |
|<--------------|
|               |

 Also, how much of the implementations out there 
look at the version in o line alone, to identify changes 
in SDPs.

 Thanks & Regards
   Shida




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