Taking example from rfc3263. For example, assume that proxy 2 is implemented as a cluster of two proxies, proxy 2.1 and proxy 2.2. Proxy 2 can be configured as default proxy for proxy 2.1 and proxy 2.2.
Another example can be gateway proxy. Vivek -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vivek Srivastava (WT01 - TELECOM SOLUTIONS) Sent: Tuesday, September 07, 2004 4:10 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: RE: [Sip-implementors] Proxy routing Hi Simith, The public Domain Naming System is designed to include at least two DNS servers authoritative for each zone. In a traditional DNS Server setup, one of these is a Primary and the other a Secondary. Primary DNS may fail because of several reasons for example...it is not having all the information about all sub zones or...fault tolerance....or load balancing. And in that case DNS look up is done by secondary DNS. Secondary DNS server may be contacted by the same proxy or by the default proxy. As per my knowledge, default proxy should not try primary DNS again and contact secondary DNS. There can be multiple paths to reach proxy B from Proxy A. And if one DNS lookup fails another proxy is contacted and again same procedure is repeated.I am not sure how default proxies are configured "manually". Vivek -----Original Message----- From: SiM [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 07, 2004 3:08 PM To: Vivek Srivastava (WT01 - TELECOM SOLUTIONS); [EMAIL PROTECTED]; [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: RE: [Sip-implementors] Proxy routing hi Vivek, Can you point to the document which describes the "Default Proxy" forwarding case in your below example, where a proxy server of A fails to get the Proxy of domain B through a DNS query . and therefore forwards it to a *default proxy* ! Is every proxy configured to route calls to a *default proxy* when it's DNS lookup for the Request URI's domain or lookup for the the target of the Request fails ? In that case, how good are the chances of the Default proxy Succeeding ? Can someone please explain ! Cheers. Simith [EMAIL PROTECTED] wrote: If [EMAIL PROTECTED] is calling [EMAIL PROTECTED] Proxy of a.com will do DNS look up to get the IP address of Proxy of b.com. IF proxy A fails then will forward it to next default proxy. And that proxy will do DNS lookup. IF proxy A succeeds then INVITE will be forwarded to b.com proxy. Proxy of b.com will search it in its Location server and then it can decide to route the call to the person ([EMAIL PROTECTED]) or to next internal proxy ([EMAIL PROTECTED]). Vivek -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Suresh P Sent: Friday, September 03, 2004 4:14 PM To: 'SiM'; 'Sip-Implementors (E-mail)' Subject: RE: [Sip-implementors] Proxy routing My question is how a.com identifies the B''s proxy? a.com only have the B's IP/domain name. Wi ll DNS look up will provide IP address of the proxy where B's connected? Hope the question is clear. May be too basic..... -Suresh -----Original Message----- From: SiM [mailto:[EMAIL PROTECTED] Sent: Friday, September 03, 2004 3:33 PM To: Suresh P; Sip-Implementors (E-mail) Subject: Re: [Sip-implementors] Proxy routing Hi Suresh, I do not fully understand your Question, If you are considering the case of [EMAIL PROTECTED] [EMAIL PROTECTED] a ---------------> b , a calling b. a.com proxy can perform a DNS lookup and find IP of b's proxy. and then send the request there, which can forward the request to B , based on B's registration in the particular domain. Maybe there are other ways also, which i'am not sure of. refer Rfc 3261, Alice and Bob example, if the above is what the scenario you are looking for ! Cheers. Simith Suresh P wrote:< BR>Hi All, A basic question. 1. if the reciever and senders are in different domain, the proxy server sends the request to a different proxy server supporting SIP. how does the proxy know which proxy is the reciever connected to ?? is the request broadcasted ? Regards, -Suresh _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors Yahoo! India Matrimony: Find your life partner online. _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors Confidentiality Notice The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain confidential or privil eged information. 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