Is there a SIP provider in the UK which provides the P-Asserted-Identity header?
- by nbolton
In the US, Flowroute (low cost SIP trunking provider) provides P-Asserted-Identity in the SIP invite request header (example screenshots). It also allows you to set the caller ID for outgoing calls, for example by using the follow in extensions.conf for Asterisk:
exten => id,n,Set(CALLERID(all)=123)
However, in the UK, I've tried a couple of SIP providers and none of them let me do either of those things (see P-Asserted-Identity or set the caller-ID).
Is this because of some sort of restriction in the UK phone networks, or is it only available to really expensive SIP trunking providers?