fax protocol t38 nse ls−redundancy 0 hs−redundancy 0 fallback pass−through fax−relay ecm disable fax−relay sg3−to−g3 Or, if there is no specific configuration on the dial−peer, then this information displays when you enter the voice service voip command. The configuration for a GW that does T38 (NSE) is: dial−peer voice voip fax protocol t38 nse ls−redundancy 0 hs−redundancy 0 fallback pass−through fax−relay ecm disable fax−relay sg3−to−g3 Configure > Telephony > Advanced Settings > Set Passthrough signaling to IOS Mode. Configure > Telephony > Port specific parameters > Choose the port to which the fax machine is connected. The configuration for a VG248 that does Modem Passthrough (NSE) is: 1. The configuration for a GW that does Modem Passthrough (NSE) is: dial−peer voice voip modem passthrough nse codec g711ulaw Protocol−based switchover is not supported with SCCP. Telco − FXO − GW − H323/SIP − CUCM − SCCP − VG248 − Fax/Modem This configuration performs both Passthrough (NSE) and T38 (NSE). The configuration for both GW and VG224 that do T38 is: no ccm−manager fax protocol cisco no mgcp fax t38 inhibit mgcp package−capability fxr−package mgcp default−packagefxr−package no mgcp fax t38 ecm The configuration for both GW and VG224 that do Modem Passthrough (NSE) is: no ccm−manager fax protocol cisco mgcp modem passthrough voip mode nse mgcp modem passthrough voip codec g711ulaw Telco − PRI − GW − MGCP − CUCM − MGCP − VG224 − Fax/Modem This configuration performs both Passthrough (NSE) and T38. Telco − PRI − GW − FXS − Fax/Modem There are no Fax over IP (FoIP) protocols involved. ![]() ITSP − SIP − CUBE − SIP/H323 − CUCM − SCCP − VG224.Telco − PRI − GW − SIP/H323 − CUCM − SIP − Fax Server.Telco − PRI − GW − MGCP − CUCM − SIP − ATA187 − Fax/Modem.Telco − PRI − GW − MGCP − CUCM − SCCP − ATA186 − Fax/Modem.Telco − FXO − GW − H323/SIP − CUCM − SCCP − VG248 − Fax/Modem.Telco − PRI − GW − MGCP − CUCM − MGCP − VG224 − Fax/Modem.SIP/H323 − Session Initiation Protocol/Voice Class H323Ĭonfigure In this section, you are presented with the information to configure the features described in this document.Ĭonfigurations This document describes these configurations:.ITSP − Internet Telephony Service Provider.CUCM − Cisco Unified Communications Manager.Just like the fax protocols, the switchover mechanism also needs to be the same in a fax call flow. Two of the most common switchover mechanisms are Named Signalling Events (NSE) (Cisco propriety) and protocol−based (Standards) switchover. A fax call begins as an audio call and then switches over to a fax call. ![]() Fax protocols, unlike audio calls, cannot be transcoded. The important point to note is that in a fax call flow, all the devices on VoIP need to utilize the same fax protocol for a fax call to be successful. With the number of fax protocols supported by Cisco devices and service providers, it is easy to get confused with all the possibilities. Introduction This document lists the most commonly encountered fax/modem call flows for which Cisco customers open Technical Assistance Center (TAC) Service Requests (SRs), along with a baseline configuration that should be present on the gateways. ![]() Mar 31, 2014Ĭontents Introduction Configure Configurations Telco − PRI − GW − FXS − Fax/Modem Telco − PRI − GW − MGCP − CUCM − MGCP − VG224 − Fax/Modem Telco − FXO − GW − H323/SIP − CUCM − SCCP − VG248 − Fax/Modem Telco − PRI − GW − MGCP − CUCM − SCCP − ATA186 − Fax/Modem Telco − PRI − GW − MGCP − CUCM − SIP − ATA187 − Fax/Modem Telco − PRI − GW − SIP/H323 − CUCM − SIP − Fax Server ITSP − SIP − CUBE − SIP/H323 − CUCM − SCCP − VG224 ATA186 − SCCP − CUCM − SIP − ATA187 Commonly Supported Fax/Modem Call Flow Configuration Examples Document ID: 115742 Contributed by Hussain Ali, Cisco TAC Engineer.
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