What happens if a call is forwarded ?
Generally, the number reported is that of the last phone to forward the call. Again there are some Telco differences so use the same precaution as in (6). If the forwarding is done by customer owned equipment there is no way of telling but will probably be the last calling number. Note that as specified, CNID is *supposed* to return the number of the originating caller but this is at the mercy of all forwarding devices, some of which may not be compliant. • What happens if I have two phone lines and a black box to do the forwarding ? If you have two phone lines or use a PBX with outdialing features, the reported number will be that of the last line to dial. Currently there is no way to tell a black box from a human holding two handsets together. • I called somebody from a company phone (555-1234) but their Caller ID device reported 555-1000. Often a company with multiple trunks from the Telco and their own switch will report a generic number for all of the trunks. There is a defined pr
Generally, the number reported is that of the last phone to forward the call. Again there are some Telco differences so use the same precaution as in (6). If the forwarding is done by customer owned equipment there is no way of telling but will probably be the last calling number. Note that as specified, CNID is *supposed* to return the number of the originating caller but this is at the mercy of all forwarding devices, some of which may not be compliant. • 8) What happens if I have two phone lines and a black box to do the forwarding ? If you have two phone lines or use a PBX with outdialing features, the reported number will be that of the last line to dial. Currently there is no way to tell a black box from a human holding two handsets together. • 9) I called somebody from a company phone (555-1234) but their Caller-ID device reported 555-1000. Often a company with multiple trunks from the Telco and their own switch will report a generic number for all of the trunks. There is a defi
Usually, the number reported is that of the last phone to forward the call. If the forwarding is done with equipment owned by the customer, there is no way to tell. CNID is supposed to return the number of the originating call, but since some forwarding devices are not compliant, it doesn’t always work. References http://www.voicecallcentral.com/help/acc/index.htm?page=source/faq/cid_faq.htm http://www.privacyrights.org/fs/fs19-cid.
Generally, the number reported is that of the last phone to forward the call. Again there are some Telco differences so use the same precaution as in (6). If the forwarding is done by customer owned equipment there is no way of telling but will probably be the last calling number. Note that as specified, CNID is *supposed* to return the number of the originating caller but this is at the mercy of all forwarding devices, some of which may not be compliant. 8) What happens if I have two phone lines and a black box to do the forwarding ? If you have two phone lines or use a PBX with outdialing features, the reported number will be that of the last line to dial. Currently there is no way to tell a black box from a human holding two handsets together. 9) I called somebody from a company phone (555-1234) but their Caller-ID device reported 555-1000. Often a company with multiple trunks from the Telco and their own switch will report a generic number for all of the trunks. There is a defined
Generally, the number reported is that of the last phone to forward the call. Again there are some Telco differences so use the same precaution as in (6). If the forwarding is done by customer owned equipment there is no way of telling but will probably be the last calling number. Note that as specified, CNID is *supposed* to return the number of the originating caller but this is at the mercy of all forwarding devices, some of which may not be compliant.
