[SIPForum-discussion] recvonly in sdp

[tester voip]

you should use sendonly and a valid ip rather than 0.0.0.0 ip.

On Sat, Sep 15, 2012 at 3:18 AM, Kashif Husain <kashifhusain29 at gmail.com>wrote:

> >The port of non-zero is not required, but I would include it for
> interoperability.
>
> Correct. It is not mandated to have non zero port, but then the media
> direction will become irrelevant when you make it zero. I think this was
> the original query.
>
>  On Tue, Sep 11, 2012 at 11:29 PM, Stephen James <sjames_1958 at yahoo.com>wrote:
>
>>   The port of non-zero is not required, but I would include it for
>> interoperability.
>>
>> From 3264 - this indicates that zero is allowed. But, you might run into
>> problems with implementations that do not support it.
>> Simply send the same port as in the previous SDP. Interesting, you have
>> 0.0.0.0 for your IP address and are stating recvonly - which doesn't make a
>> lot of sense.
>> You are receive only to a IP of 0.0.0.0. Perhaps you intend sendonly, if
>> you use that then you don't have to zero out your IP address, which is no
>> longer recommended.
>>
>> A port number of zero in the offer indicates that the
>>    stream is offered but MUST NOT be used.
>>
>>
>>
>> Stephen James
>> sjames_1958 at yahoo.com
>>
>> We are not princes of the earth, we are the descendants of worms, and any
>> nobility must be earned.
>>
>>
>>  ------------------------------
>> *From:* Prem chandiran <toprem.m at gmail.com>
>> *To:* discussion at sipforum.org
>> *Sent:* Tue, September 11, 2012 11:06:09 AM
>> *Subject:* [SIPForum-discussion] recvonly in sdp
>>
>> Hi all,
>> for putting a caller in call hold we are sending the following sdp.
>>
>> v=0
>> o=46727870367 1338208426 1338208966 IN IP4 10.47.16.5
>> s=SCM
>> c=IN IP4 0.0.0.0
>> t=0 0
>> m=audio 37384RTP/AVP 0
>> a=ptime:20
>> a=rtpmap:0 pcmu/8000
>> a=recvonly
>>
>> my question is when we send a=recvonly at that time do we need to mention
>> port in m attribute as mentioned in the above example or we have to give
>> port as 0 in m attribute?. i checked rfc 4566 in section 5. SDP
>> Specification i am able to find an example which is similar to the above
>> sdp. but still i am raising this concern since i am unable to find any line
>> in the rfc 4566 specifying while sending recvonly sdp must have m attribute
>> port as 0 or any valid port number.  if any rfc is there plz mention the
>> same . I kindly request you all to help in this.
>>
>> Thanks,
>> Prem
>>
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>>
>
>
>
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