[SIPForum-discussion] very imp question about route& recordroute

Wed Apr 25 08:24:39 UTC 2007

Hi Deepanshu,

I donot think P1 comes in the media path, also record_route header entries
for subsequent requests (not media) within a dialog.

Can u confirm.

Reg
Balaji

On 4/25/07, Deepanshu <deepanshu at huawei.com> wrote:
>
>  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 <williamp at TechMahindra.com>
> *To:* Deepanshu <deepanshu at huawei.com>
> *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
>
>
>  ------------------------------
>
> *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 <williamp at TechMahindra.com>
>
> *To:* Deepanshu <deepanshu at huawei.com> ; Srinivas .<nsrinivas at TechMahindra.com>
>
> *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.????
>
>
>
>
>  ------------------------------
>
> *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 . <nsrinivas at techmahindra.com>
>
> *To:* William Prusty <williamp at techmahindra.com> ; mwilliam prusty<callwilliam90653 at rediffmail.com>;
> 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.
>
>
>
>
>
>
>
>
>  ------------------------------
>
> *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
>
>
>  ------------------------------
>
> *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
>
>
>  ------------------------------
>
> *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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