-----Original Message-----
From: Choi,JaeEun [mailto:[EMAIL PROTECTED]]
Sent: Monday, March 12, 2001 12:59 PM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] Calling to PSTN
Hi, all.
There's many gateway to PSTN enabled SIP.
But I don't get it exactly how it works.
So, I need some explanation on calling to PSTN using UA.
When calling with telephone number, which head should include this telephone
number?
[Philip T Jacob] When the call originates from the SIP UA, usually the
destination would be a SIP URI, and this address to PSTN no: mapping will
take place somewhere else (probably where the interworking of the protocols
is done). This destination address will be present in the To: header and as
well as in the request URI.
And what should be done between Proxy Server and SIP gateway before
attempting Calling to PSTN?
[Philip T Jacob] For the UA and the proxy, there is no extra work invloved
and all the work will be done by the interworking entity. (In certain cases
your interworking entity only will act as the proxy server also. In that
case for a normal SIP call it acts as a normal SIP proxy & for the inter-
protocol calls it acts as an interworking agent.
Please give me some explanation & let me know some documents about this
issue if exist.
[Philip T Jacob] "draft-donovan-sip-gw-client-00" gives the functional
description of a SIP-PSTN gateway and is available at many places including
http://www.globecom.net/ietf/draft/draft-donovan-sip-gw-client-00.html
<http://www.globecom.net/ietf/draft/draft-donovan-sip-gw-client-00.html> .
Hope this helps
Regards,
Philip T Jacob
MindTree Consulting
Thanks in advance.
" Our Sincerity, Your Success "
" Proudly Developed By WebCall World "
Best Regards,
-----------------------------------------------------------------------------
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Choi, JaeEun
Engineer / R&D Lab
WebCall World Co., Ltd.
Suite 601, Poonglim Bldg., 823, Yeoksam-Dong, Kangnam-Gu,
Seoul, 135-824, Korea, <http://www.webcallworld.com/>
http://www.webcallworld.com
Email : jechoi <mailto:[EMAIL PROTECTED]> @webcallworld.com, Tel :
+82-2-559-3658
Fax : +82-2-559-3699
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