[Serusers] DNS SRV Query's

Hello list. I was doing some debugs on my SER machine and i found this these DNS query's: 9.381051 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 9.390312 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 9.390559 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 9.399772 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 11.337343 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _mediaproxy._tcp.sipproxy.mydomain.net 11.339614 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 11.345067 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 11.349127 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 11.349584 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 11.358696 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 17.247771 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 17.253948 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 17.254042 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 17.263298 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 18.988320 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 18.998219 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name 18.998329 10.10.10.35 -> 10.10.10.22 DNS Standard query SRV _sip._udp.sipm1.mydomain.net 19.008071 10.10.10.22 -> 10.10.10.35 DNS Standard query response, No such name What modules is generating this querys' and why ? Thanks Ricardo