AT&T IP Flexible Reach ServiceNortel BCM50 Release 3.0 SIP Configuration Guide© 2007 AT&T Intellectual Property. All rights reserved. AT&T, the AT&Tlogo and all other AT&T marks contained herein are trademarks of AT&TIntellectual Property and/or AT&T affiliated companies. All othermarks contained herein are the property of their respective owners.1 IntroductionThis document provides a configuration guide to assist Nortel Networks BCM50administrators in connecting to AT&T IP Flexible Reach service via SIP trunks.This document does not describe procedures to configure the BCM50for advanced functionality. For more information and procedures,please refer to the Nortel technical documentation found on the Nortelwebsite.1.1 Pre-IP PBX Configuration ActivityThis guide assumes that the administrator is knowledgeable in IP PBXprogramming and operations.An important tool that the administrators should have at their disposal prior totesting their IP PBX with IP Flexible Reach is a network protocol analyzer. Suchsoftware can be used to run traces on problem calls so the information can beshared with equipment and network engineers. There is a free version of suchsoftware that can be obtained at http://www.wireshark.org/.A second alternative that customers may use is TCPDUMP which can be foundon most UNIX and Linux systems. To use this software the customer should haveWireshark or TCPDUMP loaded on a server that is connected to a LAN switch orhub that can monitor both the signaling and media packets on any calls betweenthe customer PBX and the IP Flexible Reach managed router. Please note,however, that AT&T does not offer, warrant, or support this software, and anyuse of the Wireshark or TCPDUMP software is entirely at the customer’s own risk.1.2 Customer QuestionsSection 4 of this guide provides screen shots and instructions for theconfiguration of your IP PBX. Should you have questions regarding theseinstructions, please contact Brian Stegemoller at +1 (972) 685-6629. Whencalling this number please have the following information available: Company nameIssue 0.7 Page 4 of 37