SIP 301 Moved Permanently vs 503 Service Unavailable
SIP 301 (Moved Permanently) is a 3xx Redirection response, while 503 (Service Unavailable) is a 5xx Server 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, 503 means that the server is temporarily unable to process the request due to overloading or maintenance. The client should retry after the time indicated in the Retry-After header.
Descrição
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.
Quando você o vê
When a user has permanently changed their SIP address. All future calls should be directed to the new URI.
Como corrigir
Update your address book or routing tables to use the new Contact URI provided in the response.
Descrição
The server is temporarily unable to process the request due to overloading or maintenance. The client should retry after the time indicated in the Retry-After header.
Quando você o vê
During server overload, maintenance windows, or when the server is rate-limiting requests. Common during traffic spikes.
Como corrigir
Wait for the time specified in the Retry-After header. If persistent, check server capacity and consider load balancing across multiple SIP proxies.
Diferenças principais
301 is a 3xx Redirection response, while 503 is a 5xx Server 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 503: The server is temporarily unable to process the request due to overloading or maintenance. The client should retry after the time indicated in the Retry-After header.
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 503 when during server overload, maintenance windows, or when the server is rate-limiting requests. Common during traffic spikes.
Quando usar qual
For 301 (Moved Permanently): Update your address book or routing tables to use the new Contact URI provided in the response. For 503 (Service Unavailable): Wait for the time specified in the Retry-After header. If persistent, check server capacity and consider load balancing across multiple SIP proxies.