09-15-2014 10:40 AM - edited 03-17-2019 12:10 AM
Hello,
I need some help on the next question from an customer of us. The situation is as follows:
An ISDN trunk with 30 channeld (E1): needs to be splitted up in:
10 channels for inbound, 10 channels for outbound, 10 channels for overflow for both.
It's a H323 gateway and CUCM. I was thinking of the next model:
!
Trunk group ISDN-Incoming
MaxCalls 10
!
Trunk group ISDN-Outgoing
MaxCalls 10
!
Trunk group ISDN-Overflow
MaxCalls 10
!
!
interface Serial0/0/0:15
description BASICVOIP
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn incoming-voice voice
isdn send-alerting
isdn bchan-number-order ascending
trunk group ISDN-Incoming
trunk group ISDN-Outgoing
trunk group ISDN-Overflow
no cdp enable
!
!
dial-peer voice 951115 pots
trunkgroup ISDN- Outgoing
preference 1
description OUTBOUND-OTHER
destination-pattern *#0.T
progress_ind setup enable 3
progress_ind alert enable 8
progress_ind progress enable 8
progress_ind connect enable 8
!
!!
dial-peer voice 9511152 pots
trunkgroup ISDN- Overflow
preference 2
description OUTBOUND-OTHER
destination-pattern *#0.T
progress_ind setup enable 3
progress_ind alert enable 8
progress_ind progress enable 8
progress_ind connect enable 8
!
!
dial-peer voice 1007 voip
description ** DDI calls to CUCM Sub 1 ** preference 1 destination-pattern 88951....
progress_ind setup enable 3
session target ipv4:10.10.10.10
voice-class codec 1
voice-class h323 1
trunkgroup ISDN-Incoming
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
no vad
!
!
dial-peer voice 1007 voip
description ** OVERFLOW DDI calls to CUCM Sub 1 ** preference 2 destination-pattern 88951....
progress_ind setup enable 3
session target ipv4:10.10.10.10
voice-class codec 1
voice-class h323 1
trunkgroup ISDN-Overflow
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
no vad
!
The problem is you cannot place more then 1 trunk group on the serial. Is there anotherway to reach the goal?
thank you in advance.
rg
Remco
09-16-2014 12:16 AM
Hi Remco,
This cannot be done. E1 PRI is designed such that there will be 2 signaling channels for all 30 data channels and therefore, you will not be able to split the PRI into 3 groups as per the customer's requirement.
You can talk to the provider and ask them to send incoming calls to the customer site only on the last 10 channels, but there isn't a way for you to send 10 calls on the first 10 channels out and stop when the 11th call tries to go out. So it's a dead-end there too.
Thanks
Sreekanth
09-16-2014 03:50 AM
Hi ,
this is good DOC
https://supportforums.cisco.com/document/98726/how-route-outgoing-calls-through-specific-isdn-channels-e1t1
regds,
aman
09-16-2014 01:23 AM
Here is what you can do...
1. inbound--This is out of your control. You will need to tell your telco to send inbound calls to eg first 10 channels..channels. channel1-10. If those are busy they should overflow to channel (whatever you want to use eg 21-30
2. For outbound you can use channel 11-20. You will need the following configuration
conf t:
trunk group OUTBOUND
description **** Outgoing PSTN Trunk Group*****
controller e1 0/0/0
pri-group timeslots 1-31
trunk-group OUTBOUND timeslots 11-20
int serial 0/0/0:15
no ip address
isdn switch-type primary-ni
isdn incoming-voice voice
no cdp enable
trunk-group OUTBOUND
dial-peer voice 2 pots
trunkgroup OUTBOUND
destination-pattern XXXXXXXX (whatever your dial plan is)
progress_ind setup enable 3
progress_ind alert enable 8
09-16-2014 03:06 AM
I was not aware of the trunk-group timeslots under controller. That's a good thought!
09-17-2014 07:48 AM
Thnx for your reactions, I'm going to study them and try in my lab. Only the moment i'm busy with a customer project, but after that I'll work on it!
thnx
Remco
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide