/mcpIf the Document ID or URL do not match, contact tz-writers@cisco.com. Cisco Voice over IP Solutions - Fax Services • Configuring VoIP Fax Relay Using Call Manager and a Voice Gateway • Cisco IOS Fax and Modem Services over IP Application Guide • Faxing over IP Using Catalyst 6608 and VG248 • H.323 T.38 Fax Relay Issues • Cisco AVVID Gateway Support for Fax Relay and Fax Pass-Through • Voice - Configuring Fax Relay with VoIP ( T.38) • Voice Technology Support • Unified Communications Product Support • Recommended Reading: Troubleshooting Cisco IP Telephony • Technical Support & Documentation - Cisco Systems •