SIP 302 is a 'Moved Temporarily' response from a SIP server to tell the client (the phone) to go and register against a different SIP server. This is useful to help direct phones to the correct SIP server and to help load balance servers and so on.

The Message is defined in RFC 3261, but unfortunately not all SIP clients support it.

FireBrick SIP supports this, both as a server and a client.

Use Within the AAISP VoIP Platform

AAISP use this feature to enable the service to be load-balanced across multiple SIP servers, however, if your client (phone) does not support this feature then you can use the sevrer name no302.voiceless.aa.net.uk. Please do report this to the manufacturer.

Does Not Support 302

freeswitch 1.2.10
Gigaset DECT Basestations

Does Support 302

SNOM
FireBrick