When migrating from UC520/30/40 Configuration copied  over to  ISRG2 2911 causes Call Failure Introduction 500 internal server error on cisco devices signifies "Routing Failed" event. This signifies that a SIP Trunk is not configured to receive or se...

Introduction   This document provides a sample configuration to integrate Cisco Communications Manager Express operating in SRST mode (CME-as-SRST) and Cisco Unity Connection your telephony network. Requirements   Cisco recommends that you have k...

Problem Description: ================ MGCP gateway not able to register to CUCM, where a "Check-point Firewall" is between the CUCM and the Gateway. Analysis: ======== Call-flow: ========  IP-PHONE>>CUCM>>>(CHECK-POINT/FW) / MGCP>>>>>GW>>PRI>>PSTN   ...

Introduction This document describes how to configure Cisco Unified Survivable Remote Site Telephony (SRST) on Cisco IOS routers to provide redundancy to Cisco Session Initiation Protocol (SIP) Phones.   Basic Cisco Unified SIP SRST Usage: Cisco Unif...