The Generic VoIP Gateway: A business model for telcos

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file time: 2008-03-11

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The Generic VoIP Gateway:  A business model for telcos 

Michael Haberler

IPA/nic.at

   

backdrop 

there already is VoIP on the public Internet there will be ENUM-only VoIP number ranges in AT telcos will be encouraged to terminate on the Internet, or transit to a telco who has a gateway iLEC00 & LD operators will carry most of the PSTN traffic destined for these number ranges they are in excellent position to terminate these calls and grab the gateway business we00e considering first the PSTN->Internet call leg    

The ENUM-only number range in Austria 

will be +43 780 abcdef a registration of the ENUM domain will be the number allocation a cancellation of the ENUM domain will relinquish the number easy, cheap, one-step process conceptual role decoupling of number allocation and gateway operator    

the roles 

the user the ENUM registry the ITSP & ENUM registrar the telco handling the gateway traffic    

the interworking 

PSTN

ENUM-only

number range 

ITSP 

generic gateway

operator 

ENUM

Tier2 DNS 

NAPTR 

ENUM

Tier1 DNS 

number allocation & ENUM delegation

   

early exit from the PSTN 

iff the range can be determined in < 7 digits, any telco could use a GG anywhere and exit traffic early from the PSTN. this could be used for arbitrage or a cheap 00lobal00number while still retaining reachability if no GG is used. a possible migration path from geographic ranges to +87810    

result 

The GGO might or might not provide ITSP hosting service. that is, he might not have a service contract with the user. Therefore he is also not limited to his user base 00every call can be gateway regardless of ITSP. Assumption: termination revenue > termination cost (IP & GG capex/opex) with proper authentication and billing, the same gateway can also handle calls Internet-> PSTN with certified callerID.    

prerequisites 

an ENUM-only number range properly set up, such a gateway can handle several number ranges, e.g. +43 780 abcdef as well as +87810 abcdefghij for early exit from the PSTN, range must be signifcant after no more than 7 digits a gateway which does the right thing depending on NAPTR service contents doable for SIP, H.323 with Cisco SS7 softswitch and AS5XXX (ISDN); Asterisk, too nic.at will do a proof-of-concept setup escape hatch possible for further, not yet defined ENUM service types by drop & insert configuration of gateways to bounce unknown enumservices to a (future) downstream gateway.

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