Yeah, I'm aware of the methods used to support it in SIP, but I've never understood why you would want to. As RFC 3578 states, if there is some switch in the network the requires using the overlapping process to send out digits, your hand might be forced. I would think that the VoIP gateway interfacing with this element would try to buffer the full DN, but as 3578 also states, sometimes it's not possible to know for sure if you've received the full DN or not.
No matter what, it definitely isn't something you want to choose to have happen, as there is no advantage that I can see in a modern trunking network of initially sending a subset of the total digits to be dialed. Joel Gerber Network Administrator Network Operations Eastlink E: [email protected]<mailto:[email protected]> T: 519.786.1241 From: Cary FitzGerald [mailto:[email protected]] Sent: July-15-13 1:12 PM To: Joel Gerber Cc: SIP Learner; sip-implementors Subject: Re: [Sip-implementors] Overlap signaling in a native SIP network Googling for overlap signaling leads you to http://tools.ietf.org/html/rfc3578 and other discussions. Cary. On Jul 15, 2013, at 9:51 AM, Joel Gerber wrote: That's an awesome question. To be honest; I'm not sure of when it's even a good idea in a TDM network. The time you save in routing lookups is negligible in an ISUP network. Maybe during the days when MF was king it made more sense? Joel Gerber Network Specialist Network Operations Eastlink E: [email protected]<mailto:[email protected]> T: 519.786.1241 -----Original Message----- From: SIP Learner [mailto:[email protected]] Sent: July-15-13 12:49 PM To: sip-implementors Subject: [Sip-implementors] Overlap signaling in a native SIP network Dear All! In PSTN networks, it's beneficial to try to establish a connection between the caller and the callee before the full phone number digits are collected. But SIP works over the connectionless IP network, is there any benefit to use overlap signalling in a native SIP network? Are there any official standards or technical materials that documents overlap signalling in a native SIP network? Thank you very much! ZHANG _______________________________________________ Sip-implementors mailing list [email protected]<mailto:[email protected]> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected]<mailto:[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
