[SIPForum-discussion] very imp question about route& recordroute
Deepanshu
deepanshu at huawei.com
Thu Apr 26 01:19:30 UTC 2007
what srinivas wrote is quite feasible
----- Original Message -----
From: Srinivas .
To: William Prusty ; Deepanshu
Cc: discussion at sipforum.org
Sent: Wednesday, April 25, 2007 1:57 PM
Subject: RE: [SIPForum-discussion] very imp question about route& recordroute
My comments inline.
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From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of William Prusty
Sent: Wednesday, April 25, 2007 9:24 AM
To: Deepanshu
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] very imp question about route& recordroute
Can u tell me whether in the implementation it is mandatory that any UAC must be configured to any proxy (let P1).
[Srinivas] It is not mandatory to configure UAC to any proxy. The advantage if you configured any proxy is time save to identify the next hop ip address and port. Suppose the outbound proxy is not configured for UAC (A), then A should do DNS look up and server will return list of servers to try. The returned list should cache in UAC till the successful invite is sent to any server and response is received for that.
All these can be avoided if you configure outbound proxy.
As SIP is used for the establishment of interactive communications services, the time it takes to complete a transaction between a caller and called party is important. Typically, the time from when the caller initiates a call until the time the called party is alerted should be no more than a few seconds. Given that there can be multiple hops, each of which is doing DNS lookups in addition to other potentially time-intensive operations, the amount of time
available for DNS lookups at each hop is limited.
I don't think so bcz if this will be the case , then every request generated from UAC will must have an ROUTE header field.
[Srinivas] You are right.
But RFC doesn't says that Route is mandatory in the invite request
[Srinivas] You are right
Plz answer
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From: Deepanshu [mailto:deepanshu at huawei.com]
Sent: Wednesday, April 25, 2007 6:54 AM
To: William Prusty
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] very imp question about route& recordroute
yes, i think so............... P1 is a default proxy for user A to forward his request.
request will contain the route header, now if p1 wants to be in media path then it will record route
----- Original Message -----
From: William Prusty
To: Deepanshu
Sent: Tuesday, April 24, 2007 5:12 PM
Subject: RE: [SIPForum-discussion] very imp question about route& recordroute
If P1 must be configured at A ;s client , then every time the request generated by A will contains the route header field containing the address of P1
Am I right?? Plz clarify
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From: Deepanshu [mailto:deepanshu at huawei.com]
Sent: Tuesday, April 24, 2007 2:34 PM
To: William Prusty
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] very imp question about route& recordroute
P1 MUST be configured in A's client
----- Original Message -----
From: William Prusty
To: Deepanshu ; Srinivas .
Cc: discussion at sipforum.org
Sent: Tuesday, April 24, 2007 11:52 AM
Subject: RE: [SIPForum-discussion] very imp question about route& recordroute
Thank u deepansu.
If p1 is not configured in A "s client , then whether at that time A required help of DNS to find the address of p1.????
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From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Deepanshu
Sent: Tuesday, April 24, 2007 7:23 AM
To: Srinivas .
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] very imp question about route& recordroute
My understanding about this is:
P1 is the proxy server in A's domain, so the address of P1 should be configured in the A's client.
when P1 receive the request it will do the DNS query to find the location of the next hop in the target domain (as per the line mentioned by Srinivas) and then send the request to P2 which will inturn forward the request to B
Deepanshu Gautam
R&D Engineer
Huawei Technologies Co. Ltd.
Nanjing Institute, No 91 BaiXia Rd.
Nanjing, Jiangsu, P. R. China 210001
Mobile: +86-13585147627
Email: depanshu at huawei.com
----- Original Message -----
From: Srinivas .
To: William Prusty ; mwilliam prusty ; discussion at sipforum.org
Sent: Monday, April 23, 2007 6:44 PM
Subject: Re: [SIPForum-discussion] very imp question about route & recordroute
William Refer RFC 3261 Section.10.
If a user wants to initiate a
session with another user, SIP must discover the current host(s) at
which the destination user is reachable. This discovery process is
frequently accomplished by SIP network elements such as proxy servers
and redirect servers which are responsible for receiving a request,
determining where to send it based on knowledge of the location of
the user, and then sending it there.
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From: William Prusty
Sent: Monday, April 23, 2007 1:36 PM
To: Srinivas .; mwilliam prusty; discussion at sipforum.org
Subject: RE: [SIPForum-discussion] very imp question about route & recordroute
Thank a lot srinivas. Plz make me clarify one thing more
If A doesn't know IP address of p1 then how the invite request will reached at B
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From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Srinivas .
Sent: Monday, April 23, 2007 11:05 AM
To: mwilliam prusty; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] very imp question about route & recordroute
William my comments inline
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From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of mwilliam prusty
Sent: Saturday, April 21, 2007 10:20 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] very imp question about route & record route
can any body tell that
suppose the call setup is lke A p1 p2 B
here A is user agent client. B is user agent server. p1 & p2 are proxy.
1.let A has generated an INVITE request to B . in which case the invite request generated by A will conatin ROUTE header field.????
[Srinivas] Generally , proxy P1 gets IP address of B from location server also if there are any proxies in between.
Proxy P1 (generate INVITE) fills route and send INVITE.
User A can fill route set only if it knows the proxies between user A and user B.
2. let p1 has rcved the INVITE request containg ROUTE heder field.
is it mandatory that the invite from point p1 to p2 will conatin RECORD ROUTE heder field.????? if yes why if not why???
[Srinivas] In some cases, it may be useful for proxies in the SIP signaling path to see all the messages pass between the endpoints for the session. In that case it will add RECORD ROUTE. If it don't want to be in the path, it will not add the RECORD ROUTE.
plz anser
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