Comments inline... Thanks, Nataraju A B > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:sip-implementors- > [EMAIL PROTECTED] On Behalf Of Prasad, Rishi Kaushal > Sent: Monday, August 28, 2006 10:44 AM > To: sip-implementors@cs.columbia.edu > Subject: [Sip-implementors] SIP-T -> SIP ? ACK with RLC > > One question regarding the SIP-T - SIP call flow. If we get some 4xx > response from the egress side and forwarded to the ingress as 4xx+REL. > do we need to respond with ACK or ACK+RLC in the SIP-T ingress side. Is > it compulsory ? > > > [ABN] in ISUP/SIP gateways, the SIP error code would be mapped on to ISUP release cause code and vice versa.
[ABN] if you have used SIP and tunneling protocol for ISUP signaling the each of the interfaces will have their own independent signaling. On SIP side INV/4xx/ACK would complete the signaling, in the similar way on ISUP side IAM/REL would complete the signaling procedures. Each gateway should be configurable, whether to be used like tunneling or translation depending on how you use the SIP network. I mean PSTN-IP-PSTN or PSTN-IP or IP-PSTN scenarios. In case of tunneling the actual ISUP message would be carried as a payload in an appropriate SiP message. In case of translation, the information in ISUP message would be mapped into SIP response and vice versa. (in this case there could be loss of data). AFAIK the RLC message would not be carried as a payload in 4xx message, without any violation this could be done, but may not be of much use. > > > > > UAS Proxy UAC > > --> INVITE w/SDP +IAM --> INVITE > > <-- 1000 Trying > > > > <--4 XX > Error > > > > > > > > <-- 4xx +REL > > --> ACK > > > > Thanks > > > > > > > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
