If you’re using a SIP endpoint and you’ve configured your SIP phone to send custom SIP headers starting with
X-PH-, Plivo will send these SIP headers with the HTTP request.
For outbound calls, you can set custom SIP headers while :
For inbound calls, you need a SIP phone that allows custom SIP headers. If you have one, SIP headers that start with
X-PH- will sent as HTTP requests.