The International voice network is migrating towards IP based communication program. Even so the current PSTN network will remain for one more couple of years. So the interconnect function involving Voice over flag set IP and americana motorcycle patriotic PSTN plays significant role in the voice marketplace these days.

Like translation amongst two languages (English<->Dutch), Mapping of two systems comes up as simple interconnect function.

SIP-I and SIP-T are to two related approaches for interworking in between ISUP networks and SIP networks in other words normally PSTN and VoIP networks. In distinct, they facilitate conveying ISUP parameters by means of a SIP network so that calls that originate and terminate on the ISUP network can transit through a SIP network with no loss of data.

SIP-I and SIP-T each define the mapping of messages, parameters, and error codes in between SIP motorcycle patriotic impression and ISUP Networks. Both of them are completely interoperable with compliant SIP network components on the SIP network.

The way SIP-I and SIP-T let transparent transit of ISUP parameters via a SIP network is by attaching a literal copy of the original ISUP message to the SIP message at the ingress PSTN gateway this ISUP message appears as yet another body on the SIP message.

Differences between SIP-I and SIP-T are:

SIP-I was created by the ITU in 2004 (defined in ITU-T Q.1912.5)   exactly where as SIP-T was created americana motorcycle patriotic by the IETF (Net Engineering Task Force) who created SIP.

SIP-I defines a mapping from SIP to BICC in more to ISUP, although SIP-T addresses only the ISUP

SIP-T is inherently developed for interoperation with native SIP terminals, even though SIP-I is restricted for use in between PSTN gateways only

SIP-I is more precise and explicitly defines the parameters between ISUP and SIP and on best it defines the supplementary solutions for telecommunication interconnection in detail, which is not assistance by SIP-T.

SIP-I is extensively accepted by makers and Breeze Decor carriers especially soft switch and Session Border controller (SBC) vendors.


RFC3261 (Session Initiation Protocol), ITU-T  Q.1912.five(Definition of SIP-I) and RFC3372 (SIP-T)

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