607 6xx Global failure RFC 8197
SIP 607 Unwanted
The called party marked the call as unwanted (spam). Networks can use this to improve robocall filtering.
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Common causes
- The user flagged the call as spam or robocall.
How to fix it
- Review calling practices. Persistent 607s will hurt caller ID reputation.
Seeing 607 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 6xx responses
The request cannot succeed anywhere. The caller should not retry it elsewhere.