[Serusers] DNS SRV lookup issue

Hi All, I am facing problem to get SER to do a SRV lookup. I have the following scenario… Step 1: SIP UA1 registers with SER (testdomain.com) with contact address user(a)testdomain.com SIP UA2 registers with SER (testdomain.com) with contact address user(a)testdomain.com Step 2: SIP UA3 calls user(a)testdomain.com. This results in error "478 Unresolveable destination" Problem I would expect SER to do a DNS SRV lookup on testdomain.com and get sip1.testdomain.com and sip2.testdomain.com. Unfortunately, SER only does A and AAAA query. (verified via ethereal) and does not do SRV lookup. How can I make it do SRV lookup ? I am using the default ser.cfg file. FYI: using host -t srv _sip._udp.testdomain.com gives me the correct SRV response. DNS entries _sip._udp.testdomain.com. 3600 IN SRV 0 1 5060 sip1.testdomain.com. _sip._udp.testdomain.com. 3600 IN SRV 0 1 5060 sip2.testdomain.com. Any pointers would be really appreciated. Thanks, Chetan