FAX protocol

From: gladston@br.ibm.com
Date: Thu Sep 16 2004 - 15:04:25 GMT-3


I found this example to enable FAX communication over IP. It is the first time I see the command "fax protocol...".

What would occurs without this command?
(the command help says by default it will use 'system' protocol. so what?)

Voice Gateway Router 1 Configuration File

interface FastEthernet0/0
ip address 10.21.9.4 255.255.255.0
!
voice-port 1/0/0
!
voice-port 1/0/1
!
dial-peer voice 1 pots
destination-pattern 5551234
port 1/0/0
!
dial-peer voice 2 voip
destination-pattern 5555678
session target ipv4:10.5.6.7
codec g711ulaw
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco
fax rate voice

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/int_c/dpeer_c/dp_app_a.htm

===================================

fax protocol (dial-peer)
To specify the fax protocol to be used for a specific VoIP dial peer, use the fax protocol command in dial-peer configuration mode. To return to the global default fax protocol, use the system keyword or the no form of this command.

Cisco AS5350, Cisco AS5400, Cisco AS5850

fax protocol {none | system | pass-through {g711ulaw | g711alaw}}

no fax protocol

All Other Platforms

fax protocol {cisco | none | system | pass-through {g711ulaw | g711alaw}}

no fax protocol

Syntax Description
 cisco
 Cisco-proprietary fax protocol.
 
none
 No fax pass-through is attempted. All special fax handling is disabled, except for modem pass-through if configured with the modem pass-through command.
 
system
 Uses the global configuration that was set using the fax protocol command in voice-service configuration mode.
 
pass-through
 The fax stream uses one of the following high-bandwidth codecs:

g711ulawUses the G.711 u-law codec.

g711alawUses the G.711 a-law codec.
 

Defaults
system

Command Modes

http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/int_c/dpeer_c/dp_app_a.htm



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