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GRUU Support

The phone supports GRUU (draft-ietf-sip-gruu-02). The offering of this feature can be disabled from the web interface. However, GRUU is necessary for successful attended transfers (the other user agents do not have to support GRUU in this case; they only need to support RFC3261 URI properly). Therefore, we strongly recommend keeping GRUU enabled.

When receiving a successful response, the phone looks for a gruu contact header. If the header is present, it will use the gruu contact in further non-REGISTER communication with other user agents.

Example: SIP Trace

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