Jim Canfield contributed this configuration for a Patton 5200 SBC that he developed.
Patton5200SBC Config
#----------------------------------------------------------------# # # # SN5200/32B/EUI # # R5.6 2010-11-12 SIP # # 2011-02-10T16:13:21 # # SN/00A0BA053C0E # # Generated configuration file # # # #----------------------------------------------------------------# cli version 3.20 clock local default-offset +00:00 dns-client server 8.8.8.8 dns-relay webserver port 80 language en sntp-client sntp-client server primary 129.132.2.21 port 123 version 4 system hostname Patton5200 profile acl PROF-ACL-WAN profile napt PROF-NAPT-WAN static tcp 10.10.10.10 443 80 profile ppp default profile tone-set default profile voip default codec 1 g711alaw64k rx-length 20 tx-length 20 codec 2 g711ulaw64k rx-length 20 tx-length 20 dtmf-relay rtp rtp traffic-class local-default fax transmission 1 relay t38-udp profile pstn default profile sip default no autonomous-transitioning profile aaa default method 1 local method 2 none context ip router interface WAN ipaddress 100.100.100.100 255.255.255.248 use profile napt PROF-NAPT-WAN tcp adjust-mss rx mtu tcp adjust-mss tx mtu interface LAN ipaddress 10.10.10.10.1 255.255.255.0 tcp adjust-mss rx mtu tcp adjust-mss tx mtu context ip router route 0.0.0.0 0.0.0.0 100.100.100.111 0 context cs switch routing-table called-e164 fromSIPWAN route default dest-interface SIP-LAN routing-table called-e164 fromSIPLAN route 5... dest-service SERVICE-SIP-LAN route default dest-interface SIP-WAN interface sip SIP-WAN bind context sip-gateway GWSIP-WAN route call dest-table fromSIPWAN remote dallas.voip.ms interface sip SIP-LAN bind context sip-gateway GWSIP-LAN route call dest-table fromSIPLAN local sipx.yourdomain.com service sip-location-service SERVICE-SIP-LAN bind location-service LS-LAN context cs switch no shutdown authentication-service AUTHSERV username 00000 password YOURITSPPASSWORD location-service LS-LAN domain 1 sipx.yourdomain.com identity ITSPUSER authentication outbound authenticate 1 authentication-service AUTHSERV username ITSPUSER authentication inbound authenticate 1 authentication-service AUTHSERV username ITSPUSER registration inbound location-service LS-WAN domain 1 dallas.voip.ms identity-group IDENT-GROUP-WAN authentication outbound authenticate 1 authentication-service AUTHSERV registration outbound registrar dallas.voip.ms register auto call outbound call inbound identity ITSPUSER inherits IDENT-GROUP-WAN registration outbound context sip-gateway GWSIP-WAN interface ifwan bind interface WAN context router port 5060 context sip-gateway GWSIP-WAN bind location-service LS-WAN no shutdown context sip-gateway GWSIP-LAN interface iflan bind interface LAN context router port 5060 context sip-gateway GWSIP-LAN bind location-service LS-LAN no shutdown port ethernet 0 0 encapsulation ip bind interface WAN router no shutdown port ethernet 0 1 encapsulation ip bind interface LAN router no shutdown