We are in stage to configure SIP trunk to ITSP from ISR 4331 gateway, I have added following configuration, but SIP-UA registration status is showing as "no".
Call flow:
CUCM >> SIP >> Gig 0/0/0 >> ISR 4431 gateway >> Gig 0/0/1 >> SIP >> ITSP.
voice service voip
no ip address trusted authenticate
allow-connections sip to sip
fax protocol pass-through g711ulaw
sip
bind control source-interface GigabitEthernet0/0/0
bind media source-interface GigabitEthernet0/0/0
header-passing
asserted-id pai
early-offer forced
midcall-signaling passthru
privacy-policy passthru
sip-ua
credentials username xxxxxxx password yyyyyyy realm <sip registrar domain name>
authentication username xxxxxxx password yyyyyyy
retry invite 2
retry register 10
timers connect 100
timers buffer-invite 900
registrar dns:<SIP Registrar domain name> expires 3600
sip-server dns:<sip registrar domain name>
host-registrar
also tried to configured with IP address.
sip-ua
credentials username xxxxxxx password yyyyyyy realm <sip registrar domain name>
authentication username xxxxxxx password yyyyyyy
retry invite 2
retry register 10
timers connect 100
timers buffer-invite 900
registrar ipv4: xxx.xxx.xxx.xxx expires 3600
sip-server ipv4:xxx.xxx.xxx.xxx
Service provider link is directly connected on ISR gateway to gig 0/0/1. CUCM is communication with on gig 0/0/0, SIP trunk between CUCM and ISR gateway is good and E1 PRI calls are working fine.
Service provider sip server is pinging from gateway, in "debug ccsip messages" no messages shown from ISR router to service provider SIP Server host name or Ip address, can I get help what is missed here.
Enabling the CUBE feature " Mode border-element" is mandatory? CIsco TAC says that gateway automatically act as CUBE after adding the command "allow connection from SIP to SIP" in global configuration.
"Show cube status" output say "CUBE is not activated".
