ATA 187 does not work well with some fax devices, in our case it is Xerox 7228.
The config that works (little bit weird):
enable t38 on outgoing and disable on incoming
!
dial-peer voice 300 voip
no modem passthrough
session target ipv4:192.168.25.1
incoming called-number 0T
voice-class codec 1
voice-class h323 1
dtmf-relay h245-alphanumeric
fax-relay sg3-to-g3
fax nsf 000000
fax protocol t38 version 0 ls-redundancy 5 hs-redundancy 2 fallback pass-through g711ulaw
no vad
!
dial-peer voice 200 voip
destination-pattern 5..
session target ipv4:192.168.25.1
voice-class codec 1
voice-class h323 1
dtmf-relay h245-alphanumeric
fax-relay sg3-to-g3
fax nsf 000000
fax protocol pass-through g711ulaw
no vad
!
update: moved from ATA to FXS card in router and all issues are gone - isn't it a magic? Heh, Cisco? :)
update2: Cisco made available configurations scenarios: https://supportforums.cisco.com/docs/DOC-25210
3 comments:
how to debug fax on gw: https://supportforums.cisco.com/thread/2061933
1. Debug voip ccapi inout
2. Debug isdn q931 ( if pri)
3. Debug voip rtp session nse
4. Debug voip rtp session named events
and another one http://docwiki.cisco.com/wiki/Cisco_IOS_Voice_Troubleshooting_and_Monitoring_--_Fax_Relay
apparently clock sync is important for faxes, so:
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-select 1 BRI0/0/0
network-clock-select 2 BRI0/0/1
should be added to gw config.
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