PSTN-(isdn pri)->*<-(isdn pri)-old pbx

[shmaize]

Hi folks.

I have a running hardware PBX in my office and I want to integrate (and for future replace) Asterisk. This setup i want:

PSTN —(ISDN PRI)—> * <—(ISDN PRI)—> old PBX

For now my PBX is connecting to the PSTN via ISDN PRI. The box has a free module for a second ISDN PRI. Can I put Asterisk in the middle, between the PSTN and the old PBX, to comunicate * with the old pbx via ISDN PRI? Somewhere in the net i read that i need a ISDN simulator:

You cannot back to back ISDN devices. Q931 protocol has two different definitions for the Network device and the Exchange device.

As suggested elswhere, the cheapest test is an ISDN line… call yourself from one B channel to the other. This can be difficult on some devices - thecheaper ones often can’t cope with it and become confused.

Otherwise you need an ISDN simulator. These start around £2500 from memory. EmuTel make very acceptable ones.

Thanks

[AndrewZ]

I suppose you can, as soon as Asterisk is configured as network.

zapata.conf:

; pri_cpe: PRI signalling, CPE side
; pri_net: PRI signalling, Network side
signalling=

[angler]

Yes you can. 1 span on Asterisk will be cpe and the other net.

[shmaize]

Thanks for the support.
I’ll get a Sangoma A102 and A101 for the testing.