608 6xx Global failure RFC 8688
SIP 608 Rejected
An intermediary (for example, a carrier's analytics engine) rejected the call, not the user. The response may include contact details for redress.
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Common causes
- Carrier call-blocking or analytics flagged the caller ID or traffic pattern.
How to fix it
- Contact the carrier listed in the Call-Info header to dispute the block. Register your numbers with caller-ID reputation services.
Seeing 608 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.