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VoIP - Caller Display: Difference between revisions
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By default we send the incoming caller's phone number when you receive a call. This means that your phone (if it has a display) will show the number of the person calling you. It may show Unknown or Withheld if it is not known. There is also a caller's name field which we send as well, although this usually won't show the name (except on calls from other AAISP VoIP customers).
==Untrusted calls have CLI prefixed with ?==
Where an incoming call has been made using a [[VoIP_-_Calling_With_a_SIP_URI|SIP URI]] rather than the PSTN the 'number' of the person calling cannot be trusted (and may be not purely numeric) , and so we prefix that 'number' with a '?' to indicate the potential
==Caller's Number and Name==
The protocol used (SIP) to deliver phone calls to you has fields which provide the caller's number and the caller's "name" - although the name will probably not be received for calls from the PSTN. Where the name field received is the same as the number field, we will send to you the name field set to the "pretty format" of the caller's number - e.g. "020 xxxx xxxx", "07973 xxxxxx". If the name field is set to something different than the number then it will be passed on to you - in general this will only apply to calls from other AAISP VoIP customers, or from calls received using sip: URIs.
Your local hardware will display either the number, the name, or both (or neither if it has no display...). If you have an Analogue Telephone Adaptor set to sending caller display to your analogue phone(s) using BT's SIN 227 standard, then this standard also has fields for caller's number and caller's name and those fields will be populated. Note that in the SIN 227 standard '+' is not a valid character in the number field, although space (' ') and dash ('-') are allowed.
For some examples, a SIP From header could be:
In the 'tag' box, set it to N= (e.g. 2=), then the CLI will be sent as +11N (in our example, +112) followed by the number calling. This way you will be able to tell that the incoming call is one being redirected from your VoIP number and you still get the CLI of the caller.
(This feature was added 2017-04-20, but may be removed or improved - as of 2022-10-20 it seems to no longer work)
==Setting your outgoing caller ID==
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