asterisk users - Feb 2010 - SIP RTP ports not released when channel is hung up

Hello,

using Asterisk 1.4.28, I encountered a problem with SIP
RTP port allocation.

I found some entries in mailinglist and bugtracker regarding
this issue, but only old ones.

My rtp.conf has
  [general]
  rtpstart=30000
  rtpend=30100

so 100 ports available. I know that up to 4 ports per channel can be used
and so up to 25 channels are possible.
But even earlier I often get the error about "No RTP ports remaining".

I had a look at
  netstat -nuap
and it shows that a lot of ports are still assigned, even if there is no
channel in use.
But "sip show channels" show a lot of (unused) entries with no
codec/Format and "Last Message" like INVITE, REGISTER, OPTIONS.

Why aren't RTP ports released when not in use?

Or is there a possibility to configure this behaviour?

Thanks,
Armin

Hi!
> My rtp.conf has
>   [general]
>   rtpstart=30000
>   rtpend=30100
My understanding is that rtpstart should be an odd number, and rtpend an 
even one.
> so 100 ports available. I know that up to 4 ports per channel can be used
> and so up to 25 channels are possible. But even earlier I often get the
> error about "No RTP ports remaining".
> 
> Why aren't RTP ports released when not in use?
Just to confirm, I have seen that as well at least on Asterisk 1.2, most 
probably also 1.4.

Philipp

Am 11.02.2010 11:21, schrieb Armin Schindler:
> Hello,
>
> using Asterisk 1.4.28, I encountered a problem with SIP
> RTP port allocation.
>
> I found some entries in mailinglist and bugtracker regarding
> this issue, but only old ones.
>
> My rtp.conf has
>    [general]
>    rtpstart=30000
>    rtpend=30100
>
> so 100 ports available. I know that up to 4 ports per channel can be used
> and so up to 25 channels are possible.
> But even earlier I often get the error about "No RTP ports
remaining".
>
> I had a look at
>    netstat -nuap
> and it shows that a lot of ports are still assigned, even if there is no
> channel in use.
> But "sip show channels" show a lot of (unused) entries with no
> codec/Format and "Last Message" like INVITE, REGISTER, OPTIONS.
If the channels exists even after 32 seconds after BYE, and BYE was 
signaled correctly, I would file a bug report.

regards
klaus
>
> Why aren't RTP ports released when not in use?
>
> Or is there a possibility to configure this behaviour?
>
> Thanks,
> Armin
>
>