[Asterisk-Users] Rollover oddity

[Bob Bailey]

Hello,

I've got 2 analogue lines (from SBC) coming into a TDM22B. SBC
have put rollover from the first to the second line. The rollover
works fine when handsets are connected directly to the lines (ie
when Asterisk is not involved), but when the lines are connected
to Asterisk, the rollover fails: the caller just hears the line
ringing, and the person on the first (busy) line hears call
waiting interrupts.

I have proved that it's the rollover that's not taking place (ie
it is not that the rollover happens, but the second line isn't
answered)

So how (and why) does Asterisk affect the rollover in this way,
and how can a busy line going through Asterisk 'look' different
to the telco from a normal handset?

And, of course... how do I solve this?

Thanks

Bob