s SIP trunk deployments and on the inside to the enterprise or SMB's PBX or IP- PBX equipment. Using these basic SIP trunk configurations with the additional configuration excerpts given in this section allows you to customize the configurations for a wide variety of spe- cific deployments in your network. This section provides additional configuration infor- mation on the following deployments: CUBE collocated with SRST CUBE doing transcoding on a SIP trunk CUBE collocated with the integrated Cisco IOS Firewall CUBE with Tcl Scripting for additional customized call routing or treatment CUBE with SIP TLS to CUCM 224 SIP Trunking CUBE allowing Telepresence Business-to-Business interconnect Miscellaneous other helpful configurations CUBE with SRST CUBE can be used for centralized or distributed SIP trunking deployments. In a central- ized deployment, CUBE likely carries high traffic and is dedicated to the function of being a session border controller. In a distributed deployment where the SIP trunk terminates directly into a remote or branch office, the SIP trunk traffic level is generally much lower, and it is usually not cost-effective to dedicate an appliance to the SIP trunk function. In such a deployment, the Cisco IOS router already present in that remote or branch site can terminate the SIP trunk and function as the SRST router for the same site. Example 10-8 shows a configuration of CUBE and SRST on the same router. This config- uration uses Cisco IOS 12.4(20)T1 Software. Example 10-8 CUBE and SRST Configuration voice service voip (1) address-hiding allow-connections sip to sip no supplementary - service sip moved-temporarily no supplementary - service sip refer supplementary - service media - renegotiate fax protocol pass-through - g711ulaw min- se 90 header - passing error-passthru midcall - signaling passthru dial-peer voice 2000 voip (2) description Incoming Dial-Peer codec g729r8 session protocol sipv2 incoming called-number 6T dtmf-relay rtp-nte digit-drop - no vad dial-peer voice 2001 voip (2) descr