This details the requirements for interconnection with Telecom's SIP trunking service that will be rolled out this year.
savag3: After a bit more thought I honestly can't see any advantages to using Telecom's SIP trunking compared to ISDN PRI. At least not with the spec in its current state. You might save $1k for the PRI card and thats about it.
I am surprised ulaw isn't permitted though, without this you won't be able to have end to end IP calls to other providers be it in NZ or in countries like the USA.
bender: Sure, but for the sake of compatibility it wouldn't kill them to support alaw as first preference with fallback to ulaw... That way you avoid issues with hardware from American vendors (i.e. most of the PBX's) that prefers ulaw, as in the case of Cisco.
sbiddle: I'm no Cisco guru but my understanding was that Cisco will happily speak alaw from external SIP trunks to an endpoint within the network. Some parts of the network internally can only handle ulaw but this doesn't affect calling in any way. Am I totally wrong here?