483 4xx Client error RFC 3261
SIP 483 Too Many Hops
Max-Forwards reached zero before the request reached its destination. This usually means a routing loop.
Typical Q.850 / ISDN cause: 25 (Exchange routing error)
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Common causes
- Routing loop between proxies or PBXs.
- An unusually long legitimate proxy chain with a low starting Max-Forwards.
How to fix it
- Look for loops as with 482. Check the starting Max-Forwards value (normally 70).
Seeing 483 on calls through a router or firewall? Check that SIP ALG is disabled. It causes a surprising number of SIP errors. Read why.
About 4xx responses
The request has a problem or cannot be completed at this server, usually because of something on the requesting side or the target user.