OpenScape Business V2 How to: Konfiguration 1&1 Versatel SIP-TK-Anlagenanschluss Produkte: 1&1 Voice Business VT voice
![UCM6202 and 1und1: "Status 403 not supported IP in Contact-Header" - UCM62xx/UCM6510 IP PBX Appliance - UCM6202 and 1und1: "Status 403 not supported IP in Contact-Header" - UCM62xx/UCM6510 IP PBX Appliance -](https://forums5.grandstream.com/uploads/default/original/2X/0/09e97fee8cea7bde56fc19a838711cdcc9ee8ce6.png)
UCM6202 and 1und1: "Status 403 not supported IP in Contact-Header" - UCM62xx/UCM6510 IP PBX Appliance -
OpenScape Business V2 How to: Konfiguration 1&1 Versatel SIP-TK-Anlagenanschluss Produkte: 1&1 Voice Business VT voice
![UCM6202 and 1und1: "Status 403 not supported IP in Contact-Header" - UCM62xx/UCM6510 IP PBX Appliance - UCM6202 and 1und1: "Status 403 not supported IP in Contact-Header" - UCM62xx/UCM6510 IP PBX Appliance -](https://forums5.grandstream.com/uploads/default/original/2X/e/e9a47033c9d6b6e4b0a398486dccb916059e40ce.png)