On 2006-06-12 at 17:22, Donald Ritchie ([EMAIL PROTECTED]) wrote: > >I'm not at all sure, but I don't think that equipment is that smart. > >IF there is a call waiting, the CO should send the CID info, > > I wonder if anybody REALLY knows how this works ?
According to this document (http://www.shout.net/~wildixon/callerid/call-waiting-cid.html ) an acknowledgment is definitely required. Note step 3. This is where I believe the Panasonic is failing, since I'm not even hearing the data being sent in those cases where it fails. 1) 1st party is engaged in a call (ie., CPE is in off-hook state) 2) some 3rd party calls number of 1st party: An _Alerting Sequence_ is sent from the SPCS to the CPE consisting of - an audible Subscriber Alerting Signal (SAS), the Call Waiting Tone, - immediately appended to that a CPE Alerting Signal (CAS) which signals to the CPE that a Call Waiting Event has occurred. 3) the CPE now must signal to the SPCS whether it is able to receive the CID information. This is done by transmitting either a - DTMF D (Type 2 CPE), or a - DTMF A (Type 3 CPE) to the SPCS: 4) Having received such a positive ACKnowledge the SPCS now starts to transmit the CID information (in the standard 1200 bps FSK way) to the CPE. During that transmission, which may last a maximum of 1 second, the voice-path is muted. 5) The CPE, then, displays the CID information on its screen. _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
