I have an parallel ISDN connection, i. e. inbound calls should came in only in DID. Asterisk stands first and then the Analogue Telephone.
Iâ€™m wondering how should PBX be configured, so that Asterisk checks (if available) if a SIP Number exists (as extension from Asterisk) and if not, Asterisk should forward the DID at the Analogue Telephone.
Would try to explain again: if dialed 555555/222, we get in only 222. Now Asterisk should check if an SIP Client with extensions 222 exists. If there is such a SIP extension, it should connect. If such an extensions doesnâ€™t exist, Asterisk should forward the call to the Analogue Phone (Reception).
I heard that this problem can be solved only through a Script. Has anybody such a script that can share with me?
Thanks in advance,