Sarat Babu Kamisetty writes:
>I implemented SIP UAS, UAC, proxy (both stateless and stateful), registrar
>etc and using my implementation i can call to a desktop and talk in
>microphone. Now, i want to extend this and make real phone calls. Can
>somebody please tell me what exactly i need to implement to achieve this ?
>Is there some draft/rfc that describes the behavior of SIP-PSTN gateway.
>If somebody implemented that, i would like to know how complex the
>protocol is and approximately how long it will take. Please let me know if
>you know *ANYTHING* related to this (it would be better if H.323 is not
>involved in this as i know nothing about that).
An increasing number of SIP/PSTN gateways have been showing up at the
bakeoffs. To my knowledge, none are comercially available yet, but
some appear to be really close. I'm not authorised to talk about
the availability of Ericsson's products.
The minimal behavior of a SIP/ISUP gateway is described in the draft:
http://www.ietf.org/internet-drafts/draft-camarillo-sip-isup-bcp-00.txt
To build a stable SIP/ISUP gateway that you would be willing to
use on a regular basis would take a fairly large programming
team on the order of several months to a year (IMHO).
--
Adam Roach, Ericsson Inc. | Ph: +1 972 583 7594 | 1010 E. Arapaho, MS L-04
[EMAIL PROTECTED] | Fax: +1 972 669 0154 | Richardson, TX 75081 USA
