SIP 300 Multiple Choices vs 484 Address Incomplete
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 484 (Address Incomplete) is a 4xx Client Failure response. 300 indicates that the address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint. In contrast, 484 means that the Request-URI was incomplete. The server needs additional digits or information to route the call.
Description
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
When You See It
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
How to Fix
Select one of the provided Contact addresses and resend the request to that specific URI.
Description
The Request-URI was incomplete. The server needs additional digits or information to route the call.
When You See It
When dialing a partial phone number that the server cannot resolve. Common in PSTN gateway scenarios with overlap dialing.
How to Fix
Provide the complete destination address. Add missing digits or domain information to the Request-URI.
Key Differences
300 is a 3xx Redirection response, while 484 is a 4xx Client Failure response.
SIP 300: The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
SIP 484: The Request-URI was incomplete. The server needs additional digits or information to route the call.
You encounter 300 when when a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
You encounter 484 when when dialing a partial phone number that the server cannot resolve. Common in PSTN gateway scenarios with overlap dialing.
When to Use Which
For 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI. For 484 (Address Incomplete): Provide the complete destination address. Add missing digits or domain information to the Request-URI.