BE SIP trunking services. 4. This is the SP (Internet) uplink. These commands apply the firewall inspect policy mh fw rule to inbound traffic. 6. These commands apply the firewall inspect policy wan_acl out to outbound traffic. This section defines the Cisco Unity Express interface for voice mail and auto-attendant services. This section defines the outbound Cisco IOS Firewall configuration rules (lp_wan_acl). 9. This is the dial-peer for incoming SIP trunk calls. 10. This is the dial-peer for outgoing SIP trunk calls. 11. This points to the SP's SIP call agent. 12. This is the dial-peer for outgoing 911 calls over the SIP trunk. 13. These are the backup FXO trunks to use for emergency call access if the SIP trunk is down. 14. This is the SIP registration information for the CME to register with the SP's SIP call agent. This enables the SIP call agent to do direct inward dial (DID) call routing. 15. This defines the SP's SIP call agent. 16. The remainder of the configuration is for CME and its endpoints (that is, the IP-PBX configuration). Example 10-7 provides a configuration of a Cisco IOS router used purely as an Integrated Access Device (IAD) connecting the SP's service on the outside and to a privately owned keysystem or PBX on the inside. This configuration represents a Cisco IOS router running 12.4(15)T software. Example 10-7 IAD Interconnect with SIP Trunk card type e1 1 continues 220 SIP Trunking Example 10-7 continued metwork-clock-participate wic 0 clock-participate E1 1/0 metwork-clock-participate E1 1/1 network-clock- - select 1 E1 1/1 ! Firewall rule configuration ip inspect name mh_fw_rule dns (1) ip inspect name mh_fw_rule ftp ip inspect name mh_fw_rule http ip inspect name mh_fw_rule https ip inspect name mh_fw_rule icmp ip inspect name mh_fw_rule imap ip inspect name mh_fw_rule pop3 ip inspect name mh_fw_rule rcmd ip inspect name mh_fw_rule esmtp ip inspect name mh_fw_rule sqlnet ip inspect name mh_fw_rule tftp ip inspect name mh_fw_rule sip ip inspect name mh_fw_rule h323 ip inspect name mh_fw_