We’ve just installed A@H 2.1, with 2 Duxbury ISDN BRI Cards, all works well. We are trunking to 2 other A@H boxes in the UK (we’re Based in Pretoria, South Africa). All is well.
Touble is with Sip phones, hard or soft. On our box in pretoria (this is the A@H 2.1 box) if you make an outside call, which goes through the ISDN cards, the ring indication tone comes from the SIP rather than from the terminating exchange where the call is terminating. Interestingly enough, when one dials an outside number, you get a burst of the South African Ringing tone from the terminating exchange before the sip phone gives its own ring tone. We cant have this, becuase, for one, our staff are acustomed to the South African ringing tone, and second, on some of our cell networks, when you call a cell number, and the subscriber does not have voice mail enabled, and is switched off/out of range, you get a message telling you so, and this does not send answer supervision to the ISDN, so from the sip phones you get ringing tone.
Interestingly enough, when our UK based * boxes, make calls through the ISDN channels in pretoria, this does not happen., we’re still using 1.3 in the UK.
Does anyone know how we could work around this bug bear proplem ? Its minor yet rather irritating.