[cisco-voip] Post-dial Delay - two H.323 gateways with E1 interface

[Gustavo Rodrigues Ramos]

Hello,

I've configured a very simple H.323 environment. Two Cisco 2811 (IOS
12.4(15)T) as H.322 gateways with one E1 (CAS R2) interface each.
There is a PBX connected to the first gateway (through the E1
interface) and the other one is connected to the PSTN. Everything
looks good (calls are following from the PBX to the PSTN and
vice-versa), however there is a 15 seconds post-dial delay that I
couldn't fix.

I've tried to change the DTMF, H.323 and voice-port inter-digit
timeout with no change in the post-dial delay... I suspect that this
is related to the H.323 connection or codec negotiation, but can't
tell for sure. The below configuration is what I'm using in both
gateways.

If anyone can point me to a direction, I would really appreciate.

Thanks in advance,
Gustavo.



!
voice class codec 1
 codec preference 1 g729r8
!
voice class h323 1
 h225 timeout tcp establish 3
 h225 timeout setup 3
  call start fast
!
controller E1 0/2/0
 framing NO-CRC4
 ds0-group 0 timeslots 1-15,17-21 type r2-digital r2-compelled ani
 cas-custom 0
  country brazil use-defaults
  metering
  category 2
  answer-signal group-b 1
  dtmf timer inter-digit 250
!
!
!
voice-port 0/2/0:0
 cptone BR
 timeouts initial 1
 timeouts interdigit 2
 music-threshold -60
!
!
!
dial-peer voice 2 pots
 description CONNECTED to PSTN
 destination-pattern 9#T
 progress_ind alert enable 8
 progress_ind progress enable 8
 direct-inward-dial
 port 0/2/0:0
!
dial-peer voice 11 voip
 description CALL LEG TO OTHER GATEWAY
 destination-pattern 8...
 translate-outgoing called 99
 voice-class codec 1
 voice-class h323 1
 session target ipv4:192.168.x.x
 dtmf-relay h245-alphanumeric
 fax protocol cisco
!
!
gateway
 timer receive-rtp 1200
!