triggerValue

If TriggerType is RequestUriHostname, the value can be the outbound host name of a Voice Connector. If TriggerType is ToPhoneNumber, the value can be a customer-owned phone number in the E164 format. The SipMediaApplication specified in the SipRule is triggered if the request URI in an incoming SIP request matches the RequestUriHostname, or if the To header in the incoming SIP request matches the ToPhoneNumber value.