This summary of the SIP (VoIP) phone protocol shows a typical SIP call flow for providers to work with Storable CRM.
Typical SIP Call Flow
1. INVITE – Sent by the caller to initiate a call.
2. 100 Trying – Immediate response from the server to say “I got your INVITE.”
3. 180 Ringing – The call is being presented to the recipient (e.g., their phone is ringing).
4. 486 Busy Here – If the SIP line is already in-use/busy.
5. 200 OK – The recipient answered the call.
6. ACK – The caller acknowledges the 200 OK.
7. Media starts via RTP.