[asterisk-users] Block on hold

[Raj Jain]

The latter SDP seems invalid. It has an entirely different o= line
from the previous SDP. Here is a quote from section 8 of RFC 3264 that
describes this rule:

   When issuing an offer that modifies the session,
   the "o=" line of the new SDP MUST be identical to that in the
   previous SDP, except that the version in the origin field MUST
   increment by one from the previous SDP.

--
Raj Jain


On Fri, Jun 6, 2008 at 9:57 AM, Edgar Barbosa <edgars at madetowork.pt> wrote:
> Hi,
>
> I'm having a problem dialing out to a particular customer via a SIP
> provider.
> When this customer puts the call on hold on his pbx, our asterisk
> receives an INVITE with a SDP like this, and also puts the call on hold:
>
> v=0
> o=ZTE 415 1 IN IP4 xxx.xxx.xxx.xxx
> s=phone-call
> c=IN IP4 xxx.xxx.xxx.xxx
> t=0 0
> m=audio 15030 RTP/AVP 8 101
> a=sendonly
>
> We also see on cli an "Started music on hold, class 'default', on
> channel 'Local/s at webcare_firstleg-cb00,1'" message.
>
>
> Then, when he releases the hold, we get a new INVITE with a SDP like
> this, but we can't get his audio any more:
>
> v=0
> o=root 2842 2843 IN IP4 xxx.xxx.xxx.xxx
> s=session
> c=IN IP4 xxx.xxx.xxx.xxx
> t=0 0
> m=audio 18240 RTP/AVP 8 101
> a=rtpmap:8 PCMA/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-16
> a=silenceSupp:off - - - -
> a=ptime:20
> a=recvonly
>
>
> Is there any way of blocking this kind of notifications?
> We really don't need to get this external "on hold" messages.
>
> I've tried setting "allowexternalinvites=no" on sip.conf, but there's no
> difference...
>
> Thanks,
>    Edgar
>
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