[asterisk-users] 503 Server error response for REGISTER request (Asterisk v1.6.0.5)

[Vikram Ragukumar]

Hello,

Our setup involves a Sip softphone registering with a fresh install of 
Asterisk v1.6.0.5 through an outbound proxy (Kamailio v3.1.1).

We observe that about 80% of the time, immediately after startup of the 
softphone, when the softphone sends a REGISTER message, Asterisk replies 
with a "503 Server error". However, subsequent REGISTER messages are 
replied to appropriately (with a 401 Unauthorized).

There are very few devices (under 5) registered with Asterisk, so this 
is not an overload issue.

Please find attached a SIP trace for device registration.

- What might cause this behavior in Asterisk ?
- Are there any config file parameters that require to be changed ?
- Would it help to see any other specific logs, if so which ones ?

Thanks and Regards,
Vikram.

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