[cisco-voip] Fax over ip with ISDN r2

[Collins, Matthew]

Hi All,

Has anyone ever set up T38 faxing with a ISDN  E1 r2 in Brazil. I'm trying to set this up in our Sao Paulo office but having issues. The same setup is working in 15 other locations but none are using ISDN r2. Currently when a fax call comes in the call is matching the dail-peers and seems to be set up but no handshake seems to take place and the call is completely silent and after 30 seconds the call is cut. I have checked the firewalls and nothing is being blocked along the way. I'll get a debug voice ccapi inout tomorrow morning when the circuit is quite. To much traffic to capture a call cleanly at the moment

Any help much appreciated.

Current setup is

ISDN E1 r2 --> Cisco 3825 router (12.4(20)T1) --> CUCM (6.1.5.11011-2) --> ICT --> Fax server.

Router config extract

controller E1 0/0/0
 framing NO-CRC4
 clock source line primary
 line-termination 75-ohm
 ds0-group 0 timeslots 1-15,17-31 type r2-digital r2-compelled ani
 cas-custom 0
  country brazil
  metering
  double-answer
  category 2
  answer-signal group-b 1
 description **** link to TELCO ****

voice-port 0/0/0:0
 cptone BR
 description **** Telco PSTN ****

dial-peer voice 1 pots
 incoming called-number .
 direct-inward-dial
 port 0/0/0:0

dial-peer voice 7246232 voip
 description ****  TOPCALL 1 calls to Sub 2 ****
 preference 1
 destination-pattern 7246232
 session target ipv4:10.X.X.X
 dtmf-relay h245-signal
 fax-relay ecm disable
 fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco




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