Hi Samuel, What if a.com make the DNS query for SRV records for b.com and it fails? Do u mean to say that DNS lookup will not fail in any case or if it fails call will be dropped without it being forwarded to next default proxy which can again do DNS lookup?
Vivek -----Original Message----- From: Samuel Osorio Calvo [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 07, 2004 5:02 PM To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; Vivek Srivastava (WT01 - TELECOM SOLUTIONS); [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: RE: [Sip-implementors] Proxy routing Hi! There is no default proxy, when you make the DNS query for SRV records for b.com you receive all the possible hostnames responsible for b.com. Due to the parameters in the SRV record, you can make load balance between them or make one of them act as primary and the rest backups. The SIP UA will try to contact in the specified order all these hostnames and if all of them fails, the call is not forwarded. *You* can configure *your* UA with local policy in case this proceeding fails, but it is up to *you*. I recomend you again to check the RFC 3263 that explains it in details and with examples....... Samuel Unclassified. >>> SiM <[EMAIL PROTECTED]> 09/07/04 11:38AM >>> 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. Will 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: 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 privileged information. If you are not the intended recipient, please notify the sender at Wipro or [EMAIL PROTECTED] immediately and destroy all copies of this message and any attachments. Yahoo! India Matrimony: Find your life partneronline. _______________________________________________ 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 privileged information. If you are not the intended recipient, please notify the sender at Wipro or [EMAIL PROTECTED] immediately and destroy all copies of this message and any attachments. _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
