I have a test setup like:
UAC1-----SER------Third Party Proxy----UAC2
UAC1 registers to SER directly while UAC2 registers to SER via a third party
proxy. When UAC1 calls UAC2, the third party proxy replies a 100 trying then
503 Service Unavailable to SER. There is no Retry-After in the 503 message.
SER keeps re-sending INVITE.
By RFC, If no Retry-After is given, the client MUST act as if it had
received a 500 (Server Internal Error) response.
Is this a bug on SER?
Thanks,
Pat