Introduction
Information you should get from the Service Provider for provisioning SIP Trunk.
Requirement from SIP Trunk Service provider
1. SIP Trunk IP Address ie Destination IP address for INVITES. For example - 20.1.1.4 or DNS
2. SIP Trunk Port Number ie Destination port number for INVITES. - 5060
3. SIP Trunk Transport layer (TCP/UDP) - UDP
4. Codecs supported - G711, G729
5. Fax protocol support. For example - T.38
6. DTMF signaling mechanism. For example - RFC2833
7. Does the provider require SDP information in initial INVITE (Early offer required) - Yes
8. SBC's External IP address that is required for service provider to accept/authenticate calls ie source ip address for INVITE - 20.1.1.1
9. Does SIP require SIP Trunk registration for each DID? If yes what is the username and password.
10. Does SIP require Digest Authentication? If yes what is the username and password.
Configuring SIP Trunk to Service Provider network - Refer this link,
https://supportforums.cisco.com/document/12521646/configuring-sip-trunk-service-provider-network
