From VoIP.ms Wiki
SIP Trunk (Username/Password Authentication)
For the configuration below to work, you must have DNS name lookups properly configured on your router. The example below is based on IOS 15.1(3)T. Minor adjustments may be necessary for ealier IOS revisions. This example uses newyork4.voip.ms as a primary route.
Please click here Server Realms to get the Realm Name for the server you plan on using, this can differ from the Domain Name being used.
configure terminal voice service voip ip address trusted list ipv4 22.214.171.124 !Current IP address for newyork4.voip.ms at the time of this writing. ip address trusted call-block cause not-in-cug gcid clid substitute name allow-connections sip to sip no supplementary-service sip moved-temporarily no supplementary-service sip refer sip session refresh e911 transport switch udp tcp asserted-id ppi localhost dns:dns.name.of.your.device midcall-signaling passthru no call service stop sip-ua credentials username your_account password 0 your_password realm newyork4.voip.ms authentication username your_account password 0 your_password realm newyork4.voip.ms registrar 1 dns:newyork4.voip.ms expires 300 !Pick your preferred server !This dial peer will match all incoming calls for an specific DID dial-peer voice 1 voip huntstop destination-pattern ########## !Switch the # with your DID Number session protocol sipv2 session target ipv4:192.168.X.X !Your Call Manager IP Address dtmf-relay cisco-rtp rtp-nte codec g711ulaw no vad !This dial peer is for outgoing calls dial-peer voice 2 voip destination-pattern [2-9]..[2-9]...... session protocol sipv2 session target ipv4:126.96.36.199 !Your preferred server's IP address no voice-class sip early-offer forced dtmf-relay h245-alphanumeric codec g711ulaw no vad !This dial peer is for outgoing calls with the 1 prefix. dial-peer voice 3 voip destination-pattern 1[2-9]..[2-9]...... session protocol sipv2 session target ipv4:188.8.131.52 !Your preferred server's IP address no voice-class sip early-offer forced dtmf-relay rtp-nte cisco-rtp sip-kpml sip-notify codec g711ulaw no vad
!Incoming Dial-Peer dial-peer voice 4 voip session protocol sipv2 session target ipv4:184.108.40.206 !Your preferred server's IP address incoming called-number . dtmf-relay cisco-rtp rtp-nte codec g711ulaw