From: Henk Oegema <[EMAIL PROTECTED]>
   Here is some data from my system:
   1. My server has a dynamic address, updated by a DynDNS server. 
   (henkoegema.ftpaccess.cc). According to the domein provider this could be 
   used.
   2.Domain: henk.oegema.com
   3. Sip calls have to be routed to sip:[EMAIL PROTECTED]

To simplify: you want all calls to sip:[EMAIL PROTECTED] to be sent
to the server named henkoegema.ftpaccess.cc.

Note that the SRV process will not look at or modify the user-part of
a SIP URI.  In fact, SRV will not change the request-URI of a request
at all; it only specifies where the request will be sent.

The steps you need to take are:

1) Ensure that your ISP is the DNS server for the domain
   henk.oegema.com.

2) Ensure that the SIP server at henkoegema.ftpaccess.cc is prepared
   to correctly route any incoming SIP request with request-RUI
   sip:[EMAIL PROTECTED] to the proper place.  (Where or how it
   routes such requests is limited only by the server's capabilities.)

3) Provide your ISP with the SRV records.  You don't have to supply an
   NS record for henk.oegema.com, that has been done already when the
   ISP set up DNS for henk.oegema.com.  You shouldn't supply an A
   record for ns1.ascio.net -- the ISP owns ns1.ascio.net, and will
   have done that already.

The records you need will look like this:

   ; Service Proto. Name                   Pr Wt Port Target
   _sip._udp.henk.oegema.com. 43200 IN SRV 0  0  5060 henkoegema.ftpaccess.cc
   _sip._tcp.henk.oegema.com. 43200 IN SRV 0  0  5060 henkoegema.ftpaccess.cc

The Target field is allowed to be a DNS host name, so
"henkoegema.ftpaccess.cc" will be mapped by the A record to its
current address whenever this SRV record is used.

The Weight field can be 0 since you have only one SRV record for each
protocol (UDP or TCP).  (If you had more than one, Weight should be
non-0 to avoid anomalies in the RFC 3263 algorithm that are likely to
be implemented incorrectly.)

The Name field is "henk.oegema.com" because these SRV records are to
route requests for sip:[EMAIL PROTECTED]

Dale
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