[VoiceOps] SIP OPTIONS PING

[Frank Bulk]

Jesse:

Thanks for that feedback.  There's no doubt that SIP OPTIONS PING is not the
silver bullet, but our softswitch has no indication today that the control
plane is out of service, so therefore no alarming, etc.  At least if we
don't get any response we know there is some kind of connectivity failure.
Of course, you can work through the different scenarios from there.

Frank

-----Original Message-----
From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
On Behalf Of Jesse Howard
Sent: Tuesday, June 26, 2012 1:33 PM
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] SIP OPTIONS PING

This all depends on what you want from it. In my experience OPTIONS pings
are useful for identifying possible issues that may or may not require
investigation but not a good indicator of actual issues that require actual
action to be taken without human intervention. Asterisk for example will
take a peer out of service if it doesn't respond in the amount of time
specified in the "qualify" setting. While this sounds like a good thing it
requires knowing your peers and setting the "qualify" value appropriately or
you may accidentally take a peer out of service with values set too low or
may leave a peer in service too long with values too high.

As some have mentioned already some vendors do not even respond to OPTIONS,
other times you are getting a response directly from a proxy which may not
be indicative of the services behind it and many other times the service
delivering media is not the same (or even on the same subnet) as the one
delivering SIP messaging so you wouldn't want to drop calls in progress.

In the end you know your setup and (hopefully) your vendors. Use this for
what will work for you. In general the more information you can gather the
better but knowing when to take action or not to take action is more unique
to your individual needs.

Jesse

-----Original Message-----
From: Frank Bulk [mailto:frnkblk at iname.com]
Sent: Monday, June 25, 2012 9:32 AM
To: voiceops at voiceops.org
Subject: [VoiceOps] SIP OPTIONS PING

Does anyone have some real-world experience with SIP OPTIONS PING?  Our
softswitch vendor is looking to implement support and seeking some input on
check frequency, response timeouts, how quickly to check recheck on a down,
and how long to wait after it's up before restoring the SIP trunk group.
And should there be a ramp-up period through some kind of rate-limiting?

If you have a product that does it well, what parameters does it use?

How do you think the software should handle existing calls that may or may
not have active media flows?  Should it tear down calls immediately, use
some kind of active media detection, or wait x minutes before tearing down
calls?

Any input here or offline would be appreciated.

Kind regards,

Frank



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