[cisco-voip] Putting a Tandberg Codian 3241 in front of a 2851

[Robert Kulagowski]

Because 12.4T IOS doesn't do channel bonding with legacy video 
equipment, I can't use it as a H.320 <-> H.323 gateway.  I'm 
investigating something like this:

PSTN PRIs -> Codian 3241 -> VOIP dialpeer on 2851 -> CallManager 6.1 -> 
Phones

I've gotten calls to work in and outbound when I have the Codian handing 
off calls directly to the CM (and have the Codian as a H.323 GW on CM), 
but that's not going to help for SRST, because in SRST mode the phones 
will be registered to the 2851.

Which is why I'm thinking that I have the 2851 as the H.323 destination 
for the Codian.

Calls inbound to phones that are behind the Codian work. (yay)
Calls outbound through the 2851 to the Codian ring, but when the 
destination goes off hook the call isn't connected through, and the 
originating phone continues to hear ringback until it times out.  When 
the destination phone goes off hook, it just hears dead air.

Here's the configuration:
Router#term len 0
Router#sh run
Building configuration...

Current configuration : 3275 bytes
!
! Last configuration change at 09:57:00 CDT Thu May 29 2008
!
version 12.4
no service pad
service tcp-keepalives-in
service tcp-keepalives-out
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
service password-encryption
service sequence-numbers
!
hostname Router
!
boot-start-marker
boot-end-marker
!
card type t1 0 0
logging buffered 51200
!
no aaa new-model
clock timezone CST -6
clock summer-time CDT recurring
network-clock-participate wic 0
network-clock-select 1 T1 0/0/0
dot11 syslog
!
!
ip cef
!
!
no ip bootp server
ip name-server 10.1.1.6
multilink bundle-name authenticated
!
isdn switch-type primary-ni
isdn voice-call-failure 0
!
!
!
voice-card 0
  dspfarm
  dsp services dspfarm
  no local-bypass
!
!
voice call send-alert
voice call carrier capacity active
voice rtp send-recv
!
voice service voip
  allow-connections h323 to h323
  fax protocol pass-through g711ulaw
  h323
   call preserve limit-media-detection
  modem passthrough nse codec g711ulaw
!
!
voice class codec 1
  codec preference 1 g711ulaw
  codec preference 2 g729r8
  codec preference 3 g711alaw
!
!
!
voice class h323 1
  h225 timeout tcp establish 5
   call preserve
!
!
!
!
!
!
!
!
voice vad-time 65536
!
!
!
!
!
!
file prompt quiet
archive
  log config
   hidekeys
!
!
controller T1 0/0/0
  framing esf
  linecode b8zs
  pri-group timeslots 1-24
!
!
!
!
!
interface Loopback0
  description For music-on-hold
  ip address 6.6.6.6 255.255.255.255
!
interface GigabitEthernet0/0
  ip address 10.23.10.210 255.255.0.0
  duplex auto
  speed auto
  h323-gateway voip bind srcaddr 10.23.10.210
!
interface GigabitEthernet0/1
  no ip address
  shutdown
  duplex auto
  speed auto
!
interface Serial0/0/0:23
  no ip address
  encapsulation hdlc
  isdn switch-type primary-ni
  isdn incoming-voice voice
  trunk-group Local
  no cdp enable
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!
!
!
voice-port 0/0/0:23
!
!
!
!
!
dial-peer voice 210 voip
! Codian rewrites number and prefixes "21"
  destination-pattern 21....
  voice-class codec 1
  voice-class h323 1
! target is the CM 6.1 box
  session target ipv4:10.201.255.2
  dtmf-relay h245-alphanumeric
  fax-relay ecm disable
  ip qos dscp cs3 signaling
  no vad
!
dial-peer voice 220 voip
  destination-pattern 8.T
  voice-class codec 1
  voice-class h323 1
! Out to the Codian
  session target ipv4:10.23.10.209
  dtmf-relay h245-alphanumeric
  fax-relay ecm disable
  ip qos dscp cs3 signaling
  no vad
!
!
!
call-manager-fallback
  secondary-dialtone 8
  max-conferences 6 gain -6
  transfer-system local-consult
  timeouts interdigit 5
  ip source-address 10.23.10.210 port 2000
  max-ephones 10
  max-dn 20 dual-line
  system message primary Fallback mode Enabled
  transfer-pattern T
!
banner login ^C
Access to this computer system and its associated network,
computer resources, and data is restricted to those authorized.
Use by unauthorized individuals or for unauthorized purposes is a
violation of Federal and/or State law.  Violators will be prosecuted.
^C
!
line con 0
line aux 0
line vty 0 4
  password 7 xxxxxxx
  login
!
scheduler allocate 20000 1000
ntp clock-period 17180061
ntp master 10
ntp update-calendar
ntp server 10.255.1.5
ntp server 10.255.1.10
!
end