[VoiceOps] SIP return message on misdials - 487 or 500/503 or ?

[Erick Bergquist]

Hello,

Just trying to get idea of what is normal on what providers should
return for a misdial, bad unknown number, etc.

On one provider, I get a CANCEL and a 487 Request Terminated on mis-dials.

On another provider, I get a 503 Service Unavailable and a 500
Internal Service Error back.

Is there a proper code to expect or is this up to the provider? I was
working on chasing down another issue and noticed a lot of 500 and
503's on calls and they were all misdials (bad numbers, etc) on this
one provider. I can't call these numbers from other systems or my cell
phone so know they are not good numbers people are calling.

Thanks,
Erick