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Is hairpinning calls using 1 PRI in Cisco gateway possible?

Hi All,

I am trying to hairpin calls using 1 PRI in cisco gateway,

call flow

1. call comes in to gateway using PRI port 0/1 with the called number 456xxx.

2. I am matching the call using incoming pots dial-peer and then translating the 456xxx number to 654xxx number and then match an outgoing pots dial-peer and send the call out of the same PRI.

Is this call flow possible? gateway is running H323.

Thanks

2 ACCEPTED SOLUTIONS

Accepted Solutions
Hall of Fame Super Gold

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Milan, you are correct. The commands are not necessary for PSTN to PSTN calls.

However, +5 point to Rob for his continued relentless help!

Hall of Fame Super Gold

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Update IOS.

9 REPLIES

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Very much possible .

You can use num-exp rather than translation-profile for minimal configuration (if it doesn't affect any other config).

HTH.

Hall of Fame Super Red

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Hi Arvind,

Just to add a note to the good tips from Mijanur (+5 points "M")

You will need these commands

voice service voip

h323

allow-connections h323 to h323

Cheers!

Rob

Please support CSC Helps Haiti

https://supportforums.cisco.com/docs/DOC-8895

https://supportforums.cisco.com/docs/DOC-8727

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Thanks @Rob.


But I have a confusion, this is not a IP to IP call (like the concept we have for CUBE), here both of the ingress and outgress calls are over PRI i.e. over TDM channel, do we really need this 'allow-connection' command for this case?

Thanks again!

Hall of Fame Super Gold

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Milan, you are correct. The commands are not necessary for PSTN to PSTN calls.

However, +5 point to Rob for his continued relentless help!

New Member

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Hi All,

Thanks for all your reply, I am getting an assertion failure message when i try to hairpin calls.

I can see calls coming in to the gateway by matching incoming dial-peer and then the called number gets translated and matches the outbound dial-peer but the calls are not going out of PRI. I am getting an assertion failure message after matching the outbound pots dial-peer..

Please suggest.

Thanks,

Hall of Fame Super Gold

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Update IOS.

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

It's my honor to having both of you here, +5 for you too sir for both of your continuous contributions.

@aravindhanelango: please post your running-config, 'sh isdn status' and 'debug isdn q931' while failing the call.

New Member

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

Hi All,

I was able to simulate the hairpinning with different gateway running same IOS and with same configuration.

It seems i was hitting a bug with that gateway.

Thanks for all your help..

Please find the config which i used...


voice translation-rule 1
rule 1 /4734490/ /94544653/
!
!
voice translation-profile test
translate called 1


controller E1 0/1/0
framing NO-CRC4
pri-group timeslots 1-31
description >>> PRI E10 <<<<

interface Serial0/1/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp enable


dial-peer voice 100 pots
translation-profile incoming test
incoming called-number 4734490
direct-inward-dial
port 0/1/0:15
!
dial-peer voice 200 pots
destination-pattern 94544653
  port 0/1/0:15
forward-digits 7

I have also attached the Q931 debug for a successful call.

Re: Is hairpinning calls using 1 PRI in Cisco gateway possible?

So you got your answer, it's the IOS.

Try to get next/previous release of your IOS, please read the known issues first before downloading it from CCO.

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