![]() Unity IP Fax Outbound Gateway Configuration Example Unity IP Fax Inbound Gateway Configuration Example T.38 Fax Relay for Voice over IP H.323 Configuration GuideĬisco IOS Gatekeepers in Intrazone H.323 Networks Configuration Exampleįax Configuration on a Cisco WS-X6624 with an H.323 Gatewayįaxing over IP Using Catalyst 6608 and VG248 Not all Cisco voice platforms support all of these protocols or all of the fax and modem features.Ĭisco Fax Services over IP Application GuideĬisco IOS Fax, Modem, and Text Support over IP Configuration Guide, Cisco IOS Release 15.1M&T session target ras fax protocol cisco !Ĭommon call control protocols used today in enterprise solutions include H.323, SIP, MGCP, and SCCP. ! voice service voip fax protocol t38 ! interface Ethernet0/0 ip address 10.0.47.47 255.255.0.0 h323-gateway voip interface h323-gateway voip id ipaddr 10.0.47.36 1719 h323-gateway voip h323-id 36402 ! dial-peer voice 14152 voip destination-pattern 14152. ! voice service voip fax protocol cisco ! interface Ethernet0/0 ip address 10.0.47.47 255.255.0.0 h323-gateway voip interface h323-gateway voip id ipaddr 10.0.47.36 1719 h323-gateway voip h323-id 36402 ! dial-peer voice 14152 voip destination-pattern 14152. Voice call carrier capacity active ! mta receive maximum-recipients 0 ! ccm-manager mgcp no ccm-manager fax protocol cisco ! mgcp mgcp call-agent 10.3.222.1 service-type mgcp version 0.1 mgcp modem passthrough voip mode nse mgcp package-capability rtp-package mgcp fax t38 inhibit ! MGCP Fax Pass-Through: Sample configuration ![]() SIP Fax Pass-Through: Sample configuration ! voice service voip fax protocol pass-through g711ulaw sip ! dial-peer voice 2000 voip fax rate disable fax protocol pass-through g711alaw ! Modem passthrough nse codec g711alaw redundancy sample-duration 20ĭial-peer voice 500 voip incoming called-number 800 destination-pattern 550 session target ipv4:10.100.00.00 fax rate disable codec g726r32 ! H.323 Fax Pass-Through: Sample configuration T.38 fax relay is the de facto standard for FoIP transport today and allows for interoperability with third party products.įax protocol t38 ls-redundancy 0 hs-redundancy 0 ** This will cause all voip dial-peers to have fax protocol unless ‘no fax protocol t38 …’ is configured on the dial-peer** Cisco fax relay was a pre-standard fax relay implementation and is still the default on most Cisco voice gateways.ģ. ![]() Cisco currently supports two different types of relay on its voice products, T.38 fax relay and Cisco fax relay.Ģ. Relay strips off the analog carrier from the fax signal in a process known as demodulation to expose the fax HDLC data frames.ġ. VBD (Voice Band Data) is Modem Passthrough.įax protocol pass-through g711ulaw ** This will cause all voip dial-peers to have fax protocol unless ‘no fax protocol’ is configured on the dial-peer**įax Relay: Relay is the other main method for transporting fax over IP, and its implementation is a bit more complicated than passthrough. Fax Passthrough is a special case of Modem Passthrough. After that, upspeed to g711, jitter buffers are locked and echo cancellation disabledĤ. A Fax tone triggers passthrough operation. Transport of modem/fax signals through a packet network using PCM encoded packets.Ģ. While there are a number of codecs available, passthrough on Cisco voice gateways always uses the G.711 codec for carrying fax information because it offers the least distortion of the analog fax signals.ġ. I have put above three links right on top, going through the video and Q&A will get you started on FoIP.įax Pass-Through: Passthrough is the simplest method, and it works by sampling and digitizing the analog fax signal just like a voice codec does for human speech. T.38 Fax over IP Design Best Practices – Questions and Answers from live Webcastoice servi Cisco Live Webcast Archive: T38 Fax Over IP (FoIP) Training Video
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