SIP lets a business number ring on a softphone, desk handset, or compatible PBX. Start with an active DIDcomms number, the credentials in Number Settings, and one standards-compliant client.
Enter the server, E.164 username, password, transport, and port exactly as shown in the portal. The configuration example uses UDP 5060 and TCP 5061. Never share credentials in a public ticket or screenshot.
If registration succeeds but calls fail, disable SIP ALG and test on a mobile hotspot. Check inbound ringing, two-way audio, outbound caller ID, and notifications in that order.
Open the SIP service page, get a UK number, or see call costs.