Hello Siddhardha, How about using the payload type field in RTP packets?
Kedar On 5/26/06, Siddhardha Garige <[EMAIL PROTECTED]> wrote: > > Hi Nataraju, > > This is the sample invite send out by my UA. > > INVITE sip:[EMAIL PROTECTED];user=phone SIP/2.0 > Via: SIP/2.0/UDP 192.168.252.98:5061;branch=z9hG4bK31363c37f > Call-ID: [EMAIL PROTECTED] > From: Anonymous;tag=69fd5c35 > To: > CSeq: 1 INVITE > Contact: > Supported: 100rel > Max-Forwards: 70 > Allow: > INVITE,ACK,CANCEL,OPTIONS,BYE,REGISTER,PRACK,INFO,UPDATE,SUBSCRIBE,NOTIF > Y,MESSAGE,REFER > Content-Length: 311 > Content-Type: application/sdp > > v=0 > o=HuaweiSoftX3000 1481 1481 IN IP4 192.168.252.98 > s=Sip Call > c=IN IP4 127.0.0.1 > t=0 0 > m=audio 11944 RTP/AVP 8 0 4 18 97 96 > a=rtpmap:8 PCMA/8000 > a=rtpmap:0 PCMU/8000 > a=rtpmap:4 G723/8000 > a=rtpmap:18 G729/8000 > a=rtpmap:97 telephone-event/8000 > a=rtpmap:96 red/8000 > a=fmtp:97 0-15 > a=fmtp:96 97/97 > > I can open a socket and start listening on 11944 for RTP data. But how do > i knwo what codec callee is doing with out getting a response for him? > > -Sid > > > Nataraju Basavaraju <[EMAIL PROTECTED]> wrote: > Hello All, > > Assume the case where in callee wants to play some music to caller, and > the provisional responses were lost in the network. > > In this scenario, the music will not be played to caller, if the port was > not opened when the INVITE with SDP was sent out... Hence I suggest open the > RTP port for listening soon after the INVITE is sent out... > > Regards, > Nataraju A.B. > > -----Original Message----- > From: [EMAIL PROTECTED] on behalf of > [EMAIL PROTECTED] > Sent: Thu 5/25/2006 8:33 PM > To: [EMAIL PROTECTED]; [email protected] > Subject: Re: [Sip-implementors] Query on when to open RTP ports > duringoffer/answer > > > Hello Siddhardha/All , > The offer answer RFC says that you should be ready to receive media as > soon as you send the offer. > That is where my doubt comes in ... > If I start receiving my media before any answer from the other side , how > do I know for sure that it's actually the intended called party who is > sending me the packets. > Also ,after I receive the answer if the called party plays the media from > a different IP address than the one he is using to receive media , how do I > know that it's actually the called party who is playing me the media , I > looked into SRTP , but that does not seem to have a solution for this ... > Regards , > Sayan > > > ________________________________ > > From: Siddhardha Garige [mailto:[EMAIL PROTECTED] > Sent: Thursday, May 25, 2006 8:17 PM > To: Sayan Chowdhury (WT01 - IP-Multimedia Carrier & Ent Networks); > [email protected] > Subject: Re: [Sip-implementors] Query on when to open RTP ports during > offer/answer > > > Sayan, > Dont you have to wait for a response 183 or 200 OK before you open your > RTP ports? > > Siddhardah > > > [EMAIL PROTECTED] wrote: > > > > Hello All , > Once I send an offer in in INVITE I am supposed to be ready to > listen to > media. > However If I start getting media packets before getting the answer > , I > do not know for sure whether the called > Party is playing me the media or somebody else is playing me the > media. > What do I do in this case ? Should I be rejecting the media packets > till > I get an answer ? > > Also if the called party plays the media from a different IP > address > from the one which he provides in the the SDP (for receiving > media)how > can I be sure it's not some kind of attack on my UA ? > Regards , > Sayan > > > The information contained in this electronic message and any > attachments to this message are intended for the exclusive use of the > addressee(s) and may contain proprietary, confidential or privileged > information. If you are not the intended recipient, you should not > disseminate, distribute or copy this e-mail. Please notify the sender > immediately and destroy all copies of this message and any attachments. > > WARNING: Computer viruses can be transmitted via email. The > recipient should check this email and any attachments for the presence of > viruses. 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