[cisco-voip] SIP Trunk Profile w/ Options Ping

[Anthony Holloway]

I don't understand your question or concern.  Are you asking if OPTIONS
PING is best practice?  If so, then yes.  As a general practive, enabling
SIP OPTIONS PING gives you a benefit, with minimal drawbacks.

There's two drawbacks I can think of off the top of my head

1) SIP OPTIONS counts against your calls per second.  So, if you thought
you were getting 5 calls per second on your CUBE, and you're OPTIONS
PINGing two ITSPs and four CMs, then you're mistaken.

2) I found an ITSP to be sending my CUBE a handful of OPTIONS at a time,
all with the same Call-ID, and CUBE was only replying to one of them,
therefore, the ITSP was considering my trunk as down.  Through a nice chat
with TAC engineers at Cisco Live US Technical Solutions Clinic, I learned
two things:

1. CUBE will not respond to a request if it has the same call-id as a
previous request which CUBE has responded too
2. CUBE will not respond to a request if this is a second request within
the timer for sending a response (500ms by default, if memory serves)

Interestingly, the quick fix was to disable SIP OPTIONS PING to fix this
issue, which is counter intuitive to the best practice.  So, the best thing
you can do in any situation is consider all of the variables and pick the
best solution for that given situation.  I feel like sometimes people thing
"best practice" means the "right way."

On Thu, Sep 8, 2016 at 8:24 PM, Joe Loiacono <jloiacon at csc.com> wrote:

> I have found the use of the SIP profile w/ Options Ping useful as a
> barometer for detecting network problems through alerts generated when the
> SIP trunk goes down..
>
> However, when configuring a group of them for a customer, I noticed that
> some of them had previously been configured with the Ping option explicitly
> disabled (as opposed to the more normal 'Standard SIP profile'.)
>
> Was wondering what people have found as a 'best practice' along these
> lines ...
>
> Thanks,
>
> Joe Loiacono
>
> Global Infrastructure Services | m: +1-410.300-3804 | jloiacon at csc.com |
> www.csc.com
>
> This is a PRIVATE message. If you are not the intended recipient, please
> delete without copying and kindly advise us by e-mail of the mistake in
> delivery.
> NOTE: Regardless of content, this e-mail shall not operate to bind CSC to
> any order or other contract unless pursuant to explicit written agreement
> or government initiative expressly permitting the use of e-mail for such
> purpose.
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20160908/4f24bc48/attachment.html>