[Users] Route-header DNS lookup?

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;maddr=172.28.248.66;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(a)saabgroup.com