Hi,
As I said:
For VoIP over telephony networks
Your statements don't make sense; "VoIP over telephony networks" is an
oxymoron, since VoIP is, by definition, over an IP network.
some protocol is necessary between two telephony networks.
FYI, there is a protocol called TBGP proposed in IETF for the purpose.
Just a minor correction. The new name for this protocol is TRIP.
Thanx,
Dhaval
TBGP is the proposed method for binding E.164 numbers to telephony
domains, much like DNS binds names to IP addresses. One would still use
SIP (or equivalent) to actually complete the call.