cucm cube OmniPCX4400 call forward issue

Unanswered Question
Nov 20th, 2011
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Hi all

I have a setup like this,

             h323       h323

CUCM7.5 --- CUBE ----OmniPCX4400

Cube is acting as H323 gateway and PSTN gateway.

The problem is the call from OmniPCX to CUCM7.5 which is set to CFA to PSTN number drops after one ring.

(All other stuff works fine, such as call transfer).

Below is the related configuration.

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip


  no h225 timeout keepalive

voice class codec 1

codec preference 1 g711alaw

codec preference 2 g711ulaw


voice class codec 10

codec preference 1 g711alaw

codec preference 2 g711ulaw

codec preference 3 g729r8

codec preference 4 g729br8

codec preference 5 g722-64




voice class h323 1

h225 timeout tcp establish 3


dial-peer voice 11 pots

description Outgoing PRA (Dial 1)

destination-pattern 1T

progress_ind alert enable 8

clid network-number 3490001

port 0/0/1:15


dial-peer voice 20 voip

description Inbound to CUCMBE

destination-pattern 3[012]..

voice-class codec 1

voice-class h323 1

session target ipv4:

dtmf-relay h245-alphanumeric

no fax-relay sg3-to-g3

no vad


dial-peer voice 9999 voip

tone ringback alert-no-PI

description Accept all Inbound VoiP Calls

voice-class codec 1

voice-class h323 1

incoming called-number .

clid network-number 9998

no vad


dial-peer voice 6000 voip

description Alcatel OmniPCX 4400

destination-pattern [678]...

voice-class codec 10

voice-class h323 1

session target ipv4:

session transport udp

dtmf-relay h245-alphanumeric

no vad


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Arun Thomas Wed, 11/23/2011 - 13:07
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Can you please post the PRI-interface configs. Are you able to dial from OmniPCX to PSTN via H323 GW?

seungkijung Wed, 11/23/2011 - 13:53
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Good question. OmniPCX has its own PRI trunk to PSTN. The H323 gateway is used between internal phones(from OmniPCX phones to CUCM phones) and to provide PSTN connection to CUCM phones.

The design is not so fancy(this was implemented long time ago, i don't know when...), but I'd like to know if the call forward is possible in this design.

controller E1 0/0/1

pri-group timeslots 1-31

interface Serial0/0/1:15

no ip address

encapsulation hdlc

no logging event link-status

isdn switch-type primary-net5

isdn incoming-voice voice

isdn map address .* plan national type unknown

isdn send-alerting

isdn bchan-number-order ascending

isdn sending-complete

no cdp enable


One more thing, when the call was forwarded to PSTN and dropped, the q931 shows normal call clearing.

acampbell Wed, 11/23/2011 - 16:03
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  • Green, 3000 points or more


Can you try adding this to the config:-


voice service voip

supplementary-service h450.12


Try retesting



seungkijung Wed, 11/23/2011 - 16:48
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Thanks for your input.

But that didn't make any difference.

Arun Thomas Wed, 11/23/2011 - 21:26
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From the isdn debugs, do you see the router forwarding all the digits to telco? Please post the q931 debugs as well.

seungkijung Thu, 11/24/2011 - 13:30
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The q931 debug.

Bearer  Capability i = 0x8090A3

                         Standard = CCITT

                         Transfer Capability = Speech 

                         Transfer Mode = Circuit

                         Transfer Rate = 64 kbit/s

             Channel ID i = 0xA98386

                         Exclusive, Channel 6

             Calling Party Number i = 0x0883, '3490001'

                         Plan:National, Type:Unknown

             Called Party Number i = 0x88, '0212601207'

                         Plan:National, Type:Unknown

Nov 22  14:33:53.042: ISDN Se0/0/1:15 Q931: RX <- CALL_PROC pd = 8  callref = 0x9C5E

             Channel ID i = 0xA98386

                         Exclusive, Channel 6

Nov 22  14:33:58.830: ISDN Se0/0/1:15 Q931: RX <- ALERTING pd = 8  callref = 0x9C5E

             Progress Ind i = 0x8288 - In-band info or appropriate now available

Nov 22  14:34:06.966: ISDN Se0/0/1:15 Q931: TX -> DISCONNECT pd = 8  callref = 0x1C5E

             Cause i = 0x8090 - Normal call clearing

Nov 22  14:34:07.190: ISDN Se0/0/1:15 Q931: RX <- RELEASE pd = 8  callref =  0x9C5E

Nov 22  14:34:07.194: ISDN Se0/0/1:15 Q931: TX -> RELEASE_COMP pd = 8  callref =  0x1C5E


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