Configuring Multiple SIP Trunks on CME or a UC500

If you are looking to use multiple SIP trunks on a CME router or UC500 the below linked guide will help you set them up.
Just an FYI for you UC500 fans You will need to do all of your configuration from the Commandline.
http://www.cisco.com/en/US/docs/ios/voice/sip/configuration/guide/sip_cg-multi-registrars.html
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integrating Cisco CME with spa8000
I have a cisco 2821 router with call manager express installed on. I wan to integrate with linksys spa8000 and use ordinal analog to connect to FXS port and configure them as ephones. Is it possible? if yes how do are go about it.
thanks
sip trunk
i have registered an account with callcentric.When i try making a call it doesnt go through.sip-ua config is as follows;
sip-uacredentials username xxxxxx password xxxxxx realm callcentric.comauthentication username xxxxxxpasswordxxxxxxno remote-party-idretry invite 4retry response 3retry bye 2retry cancel 2retry register 5timers register 250registrar dns:callcentric.com expires 180sip-server dns:callcentric.com
dial-peer
dial-peer voice 10 voip description ****INTERNATIONAL VOIP***** translation-profile outgoing international-voip destination-pattern 9.T session protocol sipv2 session target dns:callcentric.com dtmf-relay sip-notify rtp-nte codec g711ulaw no vad
sip trunk
i have registered an account with callcentric.When i try making a call it doesnt go through.sip-ua config is as follows;
sip-uacredentials username xxxxxx password xxxxxx realm callcentric.comauthentication username xxxxxxpasswordxxxxxxno remote-party-idretry invite 4retry response 3retry bye 2retry cancel 2retry register 5timers register 250registrar dns:callcentric.com expires 180sip-server dns:callcentric.com
dial-peer
dial-peer voice 10 voip description ****INTERNATIONAL VOIP***** translation-profile outgoing international-voip destination-pattern 9.T session protocol sipv2 session target dns:callcentric.com dtmf-relay sip-notify rtp-nte codec g711ulaw no vad
Configuring Credentials for
Configuring Credentials for Endpoints to Register with Multiple Registrars on a SIP Trunk: Example
The following example shows how to configure credentials for endpoints on a Cisco IOS SIP TDM gateway, Cisco Unified CME, or Cisco UBE to register with multiple registrars ("Example1.com" and "Example2.com") on a SIP trunk simultaneously:
Router> enable
Router# configure terminal
Router(config)# sip-ua
Router(config-sip-ua)# credentials number 1111 username MyUsername password MyPassword
realm Realm.example1.com
Router(config-sip-ua)# credentials number 1111 username MyUsername2 password
MyOtherPassword realm AnotherRealm.example1.com
Router(config-sip-ua)# credentials number 2222 username TheirUsername password
TheirPassword realm Realm.example1.com
Router(config-sip-ua)# credentials number 2222 username TheirUsername2 password
TheirOtherPassword realm AnotherRealm.example1.com
Router(config-sip-ua)# registrar 1 dns:example1.com expires 180
Router(config-sip-ua)# registrar 2 dns:example2.com expires 360