10-06-2011 07:43 AM
Is it possible to configure support for the below described requriments with Cisco routers/devices?
Topology:
2 x Meridian SL-1 PBXes with a Cisco network between them to support the following requirements:
-QSIG CCS signaling, Euro ISDN, PRI net5
-The signaling channel (D-channel) is transparent (P2P)
-All B-channels (30) should be open towards the pbx’s in both ends
-No traffic to be sent over the wan unless there is any calls going (spoofing)
-The pbx chooses which B-channel to use for a call, signals it, and the Cisco routers must then "unspoof" this channel
-Codec to be used G729
A collegue was suggesting this way to solve it:
-Configure all the channels on the PRI on the routers/gateways connected via PRI to the to be open permanently
-Congure timeslot 16 to 64kbps transparent
-Configure the othe timeslots to G729 and Voice Activity Detection to make sure no data will be transmitted unless there is any speach going over
Anyone configured anything simliar before?
I guess a challenge would be to have the timeslots open with g729 configured?
Best Regards
Ørnulf
10-18-2011 12:10 PM
That is a normal configuratio with Cisco routers. You should engage a reputable consultant to put it in practice.
10-18-2011 12:33 PM
Thats not an option and not much help. Its certanly not a very common configuration and TAC even could not give us any help on this.
I belive it is transparent CSS as described in this document I might need:
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800a96c1.shtml
With this post I was hoping for some feedback from other people that had done the same configuration incorporating Meridan PBXes and Cisco routers between like described above.
Best regards
Ørnulf
10-21-2011 03:07 PM
In any case, you probably do not need transparect CCS. It is only needed for non ISDN signaling, but you have ISDN. Just confgiure switch-type QSIG, and router will realy any message to the other side.
03-05-2012 02:13 AM
Paolo,
do you think that simply configuring switch-type QSIG would helps us achive the following requirements:
Our customer calls this feature PRI-IDLE on their Meridians.
BR
Ornulf
PS: some links I am looking at to see if this is what we can use for configuration:
http://www.cisco.com/en/US/docs/ios/12_0/12_0x/feature/guide/tccs_7xk.html
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800a96c1.shtml
03-06-2012 04:10 AM
Why you need the channels constanly open, as mentioned above,, if the PBX uses ISDN/Q.SIG, you don't need that.
03-08-2012 02:16 AM
Paolo,
thanx for your reply. Its not crystal clear, but our customer tells us its because they have a propritary CDR application that actually do billing on voice activation detection on the permanent open channels.
I know, a very odd case, but thats the requirments we are met with.
So again in short, we need to configure:
Topology: Meridian PBX-PRI-Cisco router-WAN-Cisco router-PRI-Meridian PBX
All inputs/suggestions to how to configure this on the Cisco routers are greatly appreciated.
BR
Ornulf
03-16-2012 12:37 AM
Yes very strange, so there is another peice of hardware that do billing based on voice dectection? Can you identify it, personally. Note however that assuming such a thing, it would work on regular PRI as well, when detecting the transition from idle B channel, to open-idle, to to open-voice.
That is because many customers often don't know exactly how things are done. They wouldn't be customer otherwise.
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