Simulating service provider ISDN Network Terminal

[Oknet]

For testing purpose , i need to simulate a telephony service provider network terminal (Italy here) with an old Cisco 1751V (or 1760)

Mi BRI config is :

voice-port 0/1
compand-type a-law
cptone IT



interface BRI0/1
no ip address
isdn switch-type basic-net3
isdn overlap-receiving
isdn protocol-emulate network
isdn layer1-emulate network
isdn incoming-voice voice
isdn map address . plan unknown type unknown
isdn sending-complete
isdn skipsend-idverify
line-power

dial-peer voice 30 pots
destination-pattern 02........
port 0/1

An asterisk PBX is behind cisco router to place the call,  when 02xxxxxxxx is matched an ISDN phone connected to bri0/1 rings receiving correct MSN and call is answered correctly.

However with another TE connected to bri0/1 (i.e. a Patton smartnode as gateway to another pbx) still have some problems, remote pbx rings matching the correct MSN but B1 channel doesn't come up and call is released with q931 error.

The same Patton/Pbx works fine with local providers ISDN NT

Any hint ??

Thank you. 

[Maren Mahoney]

To configure ISDN back to back you will need to set the clock properly (internal vs. line) and also set the isdn network-emulation so that the "provider" side behaves as a provider would. Give the following a read and let us know if it helps or if you need more information or help:  

Configuring Network Side ISDN BRI Voice Interface Cards:
https://www.cisco.com/c/en/us/support/docs/voice/digital-ccs/15415-bri-voice-port-cfg.html

Maren