Not very clear about the question you are asking. Here the precondition needs to be met means , it need to be ensured that there is bandwidth for media flow. If bandwidth is there, it will be reserved for this call and then the destination endpoint alerts user (phone rings).
In addition to qos there are other preconditions like security-precondition , but its not the topic of interest. Thanks Kamal Cisco, Bangalore India -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Premalatha Kuppan Sent: Thursday, February 25, 2010 11:39 AM To: [email protected] Subject: Re: [Sip-implementors] QoS paramters Continuation of my prev thread: The RFC 3312, says about Current, desired status , strength tag etc.. but this to ensure that session should be established only when the pre-conditions are met by both end. But what all the Pre-conditions, still its not clear to me. I appreciate your help. On Thu, Feb 25, 2010 at 11:35 AM, Premalatha Kuppan < [email protected]> wrote: > As you said, Jitter and Delay are related to RTP. > > But QOS is for Media (audio/Video) right ? During session > establishment, there is an option to send the BW in SDP, likewise is > there any other parameters to carry other QOS parameters (like jitter, > delay, throughput etc...). > > Because, the draft says, > > a=curr:qos e2e send > a=des:qos optional e2e send > a=des:qos mandatory e2e recv > > > > Also RFC 3312 says, Precondition defined for QOS and there would be a > local status table and transaction status table. But i couldn't > understand what exactly value or QOS related parameters would be there in those tables. > SInce its at UA, each UA can have different QOS capabilities (!?). > > Correct me if iam wrong. > > > > On Thu, Feb 25, 2010 at 10:14 AM, Avasarala Ranjit-A20990 < > [email protected]> wrote: > >> >> The jitter and delay are related to RTP. So a SDP that is part of SIP >> INVITE cannot send them. >> >> >> Regards >> Ranjit >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of >> Kamalakanta Palei (kpalei) >> Sent: Thursday, February 25, 2010 7:45 AM >> To: Premalatha Kuppan; [email protected] >> Subject: Re: [Sip-implementors] QoS paramters >> >> >> I have not seen jitter and delay parameters in SDP. >> >> Thanks >> Kamal >> Cisco, Bangalore >> India >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of >> Premalatha Kuppan >> Sent: Wednesday, February 24, 2010 11:19 PM >> To: [email protected] >> Subject: Re: [Sip-implementors] QoS paramters >> >> Thanks. >> >> Between, regarding precondition on QOS, i read the RFC 3312. But >> still not clear whether the UA sends other QOS parameters like >> jitter, Delay other than BW. >> >> If someone brief it, it would be good. >> >> On Wed, Feb 24, 2010 at 7:24 PM, Kamalakanta Palei (kpalei) < >> [email protected]> wrote: >> >> > Hi Prem >> > You can explore more on below SDP. That will give better >> > understanding >> >> > on precondition QoS. >> > >> > m=video 3400 RTP/AVP 98 99 >> > b=AS:75 >> > a=curr:qos local none >> > a=curr:qos remote none >> > a=des:qos mandatory local sendrecv >> > a=des:qos none remote sendrecv >> > >> > Thanks >> > Kamal >> > Cisco, Bangalore >> > India >> > >> > -----Original Message----- >> > From: [email protected] >> > [mailto:[email protected]] On Behalf >> > Of Bharat S >> > Sent: Wednesday, February 24, 2010 10:25 AM >> > To: Premalatha Kuppan; [email protected] >> > Subject: Re: [Sip-implementors] QoS paramters >> > >> > RFC 3312 explains the SDP Preconditions mechanism that allows UE to >> > delay completion of a SIP session establishment until one or both >> > sides have successfully completed their resource reservation. >> > >> > IETF has defined the precondition-type "qos". >> > >> > -Bharat >> > >> > >> > >> > >> > >> > ________________________________ >> > From: Premalatha Kuppan <[email protected]> >> > To: [email protected] >> > Sent: Tue, February 23, 2010 3:30:38 PM >> > Subject: [Sip-implementors] QoS paramters >> > >> > Hi, >> > >> > Please tell me what are all the QOS related paramters carried in >> > SIP/SDP (both in answer and offer). >> > >> > Thanks, >> > Prem >> > _______________________________________________ >> > Sip-implementors mailing list >> > [email protected] >> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > >> > >> > >> > >> > _______________________________________________ >> > Sip-implementors mailing list >> > [email protected] >> > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > >> _______________________________________________ >> Sip-implementors mailing list >> [email protected] >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> >> _______________________________________________ >> Sip-implementors mailing list >> [email protected] >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >> > > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
