[Asterisk-Users] Bug in SUBSCRIBE handling : running out of RTP ports

[Olle E. Johansson]

Sarat Vemuri wrote:
> While trying to deploy a bunch of Polycom IP 500 phones, I ran in to the 
> following.  I limited the RTP ports from 8000-8050 to limit holes in 
> firewall.  Pretty soon Asterisk ran out of RTP ports.  Traced the 
> problem back to how * is handling SUBSCRIBE.  A sip structure is 
> allocated as soon as a request is received, which also allocates RTP 
> ports.  Normally, this is not a problem as the structure is released as 
> soon as the request is answered, which is pretty quick.  However, 
> SUBSCRIBE has an expiry header, till which time * keeps around the call 
> structure and hence hanging on to those RTP ports.  (SUBSCRIBE doesn't 
> even need an RTP port).  This problem is amplified by Polycom "Buddy 
> Lists" as each phone subscribes to changes in extension status of all 
> the "buddy" up to 7 extensions.
>  
> I just added few lines in handle_request functions to release RTP ports 
> if it is a subscribe.  Seem to work fine..  Should I send this to Dev 
> list or somewhere?
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Thank you for contributing.

/Olle