[cisco-voip] SIP option ping prioritization

[Anthony Holloway]

1) It's a SIP Message, specifically the OPTIONS message

2) Typically you only prioritize voice traffic and not signaling, but you
should still reserve bandwidth for signaling to ensure it's not starved.
CUBE marks all signaling traffic as AF31 by default, but CS3 is the newer
standard to go with.  Make sure you're QoS policy is matching on AF31
and/or CS3 and reserving bandwidth for it.

3) In the absence of a session transport command, the default is UDP,
that's typical for carrier facing SIP trunks.

4) I have not seen OPTIONS prioritized before. It's treated with the level
of service as all SIP and therefore all signaling

On thing people forget is to use a profile on dial-peers which reference
server groups.

See here for a little more info on that:
https://supportforums.cisco.com/t5/video-over-ip/sip-options-ping-and-session-server-group-on-dial-peer/td-p/2994584

On Sun, Aug 27, 2017 at 9:56 PM Ki Wi <kiwi.voice at gmail.com> wrote:

> Hi Group,
> I would like to find out if SIP option ping is a "ping" or a "sip message"
> ?
>
> From the documents, it seems like it is a sip messages.
>
> My customer is facing issue with the dial-peers getting busy out during
> WAN congestion. We would like to prioritize those messages as a WAN
> provider but they are not able to give us the exact commands for the CE
> router.
>
>  Currently this is the command on all their managed "voice gateway"
>  * voice-class sip options-keepalive up-interval 120 down-interval 120
> retry 2
>
> This means the "transport" mode is default. This make things more complex,
> I have no idea it is TCP or UDP or ???
>
> With no access to customer network (unable to do wireshark), I would like
> to see if there's anyone having the experience to prioritize those SIP
> option ping packets?
>
>
> --
> Regards,
> Ki Wi
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