[cisco-voip] Fax over ip with ISDN r2

[Nick Matthews]

I would suggest a normal phone call - more than likely this is not a
faxing issue.  I would try to do a packet capture on the fax server.

As well - don't use ICTs for things that aren't CUCM.  It's a tweak on
H.323 and many other endpoints are going to reject the tweaks, so use
a H.323 gateway or SIP trunk instead.

-nick

On Tue, Jun 7, 2011 at 11:09 AM, Collins, Matthew
<matthew.collins at linklaters.com> wrote:
> 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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