SIP 301 Moved Permanently vs 483 Too Many Hops
SIP 301 (Moved Permanently) is a 3xx Redirection response, while 483 (Too Many Hops) is a 4xx Client Failure response. 301 indicates that the user can no longer be found at the address in the Request-URI. The client should direct future requests to the new address in the Contact header. In contrast, 483 means that the Max-Forwards header has reached zero, indicating the request has passed through too many proxies.
Description
The user can no longer be found at the address in the Request-URI. The client should direct future requests to the new address in the Contact header.
When You See It
When a user has permanently changed their SIP address. All future calls should be directed to the new URI.
How to Fix
Update your address book or routing tables to use the new Contact URI provided in the response.
Description
The Max-Forwards header has reached zero, indicating the request has passed through too many proxies.
When You See It
When a request traverses more proxies than the Max-Forwards counter allows (default 70). Often indicates a routing loop.
How to Fix
Check for routing loops. If the path is legitimately long, increase Max-Forwards. Usually indicates misconfigured routing.
Key Differences
301 is a 3xx Redirection response, while 483 is a 4xx Client Failure response.
SIP 301: The user can no longer be found at the address in the Request-URI. The client should direct future requests to the new address in the Contact header.
SIP 483: The Max-Forwards header has reached zero, indicating the request has passed through too many proxies.
You encounter 301 when when a user has permanently changed their SIP address. All future calls should be directed to the new URI.
You encounter 483 when when a request traverses more proxies than the Max-Forwards counter allows (default 70). Often indicates a routing loop.
When to Use Which
For 301 (Moved Permanently): Update your address book or routing tables to use the new Contact URI provided in the response. For 483 (Too Many Hops): Check for routing loops. If the path is legitimately long, increase Max-Forwards. Usually indicates misconfigured routing.