hi SRV records are all in place, but as I trace the DNS lookup queries sent by the OpenSER host, it only asks for A records for "iptel1.ipatl.se" and no NAPTR or SRV. the hostname that the NAPTR and SRV records points to is "sip.iptel1.ipatl.se", but this is not resolved by OpenSER for the route-header destination.
but, for the initial INVITE, OpenSER correctly queries NAPTR and SRV rr to resolv the hostname/IP of the server responsible for the domain "iptel1.ipatl.se".
i'm familiar with the rfc3263, and all is set up correctly and working just fine.
best regards, /staffan
-----Ursprungligt meddelande----- Från: users-bounces@openser.org [mailto:users-bounces@openser.org] För Norman Brandinger Skickat: den 6 juli 2006 14:57 Till: users@openser.org Ämne: Re: [Users] Route-header DNS lookup?
Hi Kerker,
Perhaps there needs to be SRV records in the DNS server that manages iptel1.ipatl.se.
Below are example SRV records. If this is your first time working with SRV records, I strongly suggest reading some of the online doc that deals with them.
_sip._tcp.iptel1.ipatl.se. IN SRV 0 0 5060 sip.iptel1.ipatl.se. _sip._udp.iptel1.ipatl.se. IN SRV 0 0 5060 sip.iptel1.ipatl.se.
Regards, Norm
Kerker Staffan wrote:
hi i recently bounced into this problem, and i'm not sure here. i'm running the openser-devel, with the cacheless
db_mode=3. (works
fine btw)
the record-route header received by the proxy on the other side (SNOM4S), inserts the domain name (iptel1.ipatl.se) and not the hostname (sip.iptel1.ipatl.se) in the record-route header,
and uses the maddr=<ip_of_server> with the actual server IP address.
now, when my client (behind the OpenSER) replies with an
ACK to the
incomming OK, it uses the Route-header recieved in the
RR-header, and
sends the ACK to OpenSER. i then get the following errors
in OpenSER.
/usr/local/sbin/openser[3583]: ERROR: mk_proxy: could not
resolve hostname: "iptel1.ipatl.se"
/usr/local/sbin/openser[3583]: ERROR: uri2proxy: bad host
name in URI
<sip:4ffec4ce755c218a72228c6643cb3b6b@iptel1.ipatl.se:5060;ma ddr=172.2
8.248.66;transport=udp;lr>
the ACK i sent look like this:
Request-Line: ACK sip:2307@iptel1.ipatl.se;gruu=6fg9n6dl SIP/2.0 Via: SIP/2.0/UDP
172.28.248.52:2051;branch=z9hG4bK-d96b1fvapkyn;rport
Route: <sip:172.28.248.10;lr=on;ftag=li9buf1i4p> Route:<sip:4ffec4ce755c218a72228c6643cb3b6b@iptel1.ipatl.se:5060 ;maddr= 172.28.248.66;transport=udp;lr>
From: "Snom 2652" <sip:2652@ipatl.se>;tag=li9buf1i4p To: <sip:2307@ipatl.se>;tag=hvseiz7kgb Call-ID: 3c269d83900b-xj3ild14y880@snom360 CSeq: 1 ACK Max-Forwards: 70 Contact: <sip:2652@172.28.248.52:2051;line=cp4a7ljd> Content-Length: 0
as far as i understand, according the rfc 3263, the
route-header may
contain domain name that has to be resolved using SRV.
"6 Constructing SIP URIs
In many cases, an element needs to construct a SIP URI
for inclusion
in a Contact header in a REGISTER, or in a Record-Route
header in an
INVITE. According to RFC 3261 [1], these URIs have to have the property that they resolve to the specific element that inserted them. However, if they are constructed with just an IP
address, for
example:
sip:1.2.3.4
then should the element fail, there is no way to route
the request or
response through a backup.
SRV provides a way to fix this. Instead of using an IP
address, a
domain name that resolves to an SRV record can be used:
sip:server23.provider.com"
now, OpenSER only asks DNS for an A record of the name
recieved in the
route header, and since that's a domain name, it's
unresolvable, and so the ACK is never sent.
any hints or clues?
best regards, /Staffan Kerker
-- Staffan Kerker Saab Communications, Växjö p. +46 470 42185 c. +46 705 391365 m. staffan.kerker@saabgroup.com
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-
Kerker Staffan