I am using a GXW4104 with trixBox. so far I have managed to accept incoming calls and forward them to a ring group, and place outgoing calls, with no significant problems. I have configured it using the "PEER" approach, where no GW-specific sip accounts or extensions have been created. The only issue I have seen so far is that sometimes Called ID does not work on incoming calls, but that is probably a telco issue, as Caller ID on POTS lines is not a very reliable operation anyway.
Now comes the question(s) :
I have connected 4 PSTN lines to the FXO. I would like only two of them to be used for out-dialling (two SPECIFIC ones, such as FXO1 and FXO2), while all four should be used to answer calls.
As far as the grandstream documentation goes, the unit uses a round-robin line allocation algorithm, and not a FIFO policy. so, the first outgoing call is placed on FXO1, and , even if it finishes before the second call is placed, the next line will be FXO2. this does not give me any opportunity to do things like :
"always use line1, unless it is busy, then use line2, unless it is busy..", in other words, sequential line assignment.
This is extremely important for me, because the 4 lines have different cost rates. so:
Q: is there a way to tell Grandstream (via the SIP handshake or otherwise) to dial out using a specific line, instead of the round-robin logic ?
Q: if not, is there a way to tell Grandstream to NOT use a line for out-dialling at all, but only for incoming ?
Member Since:
2007-04-26