[cisco-voip] one way audio after SIP cupover

[Anthony Holloway]

Ryan,

For what you said here:

*"Your call doesn’t appear to have a need for MTP or Transcoding (G711 both
sides and matching sample sizes); so I wouldn’t start there."*

Don't forget that DTMF relay needs to match too, and this is something, in
my opinion, that people miss-configure a lot!  In fact, I see people with
h245 alpha on their SIP dial peers?  Like what?  Typically, the SIP ITSP
will support RTP-NTE (RFC2833 [RFC 4733]) only, and your CUBE will need to
inter-work that DTMF with an OOB DTMF relay, such as SIP NOTIFY.  But then
your SIP Trunk Sec Prof will need to allow Unsolicited Notifications in
order for that to work.  Also, some devices can support RTP-NTE, but
usually your CTI based apps cannot.  E.g., UCCX

And for here:

*"CUBE: ip trusted address list (make sure all provider signaling and media
addresses are authorized or ip authentication is off (which I do not
recommend) and make sure you include any CUCM addresses that are not used
in dial peers)."*

Since this feature is just for signaling, and the call does establish, this
wouldn't be the cause of an RTP issue, and you wouldn't be putting your
media addresses in here.

Do you agree with both of those remarks, or did I misunderstand something?

On Mon, Feb 5, 2018 at 5:14 PM Ryan Huff <ryanhuff at outlook.com> wrote:

> Empirically, this “looks” like one way audio. How long will the call stay
> connected? Indefinitely? 30 seconds? 2 minutes?
>
> Your call doesn’t appear to have a need for MTP or Transcoding (G711 both
> sides and matching sample sizes); so I wouldn’t start there.
>
> Check these items and see what you find;
>
> CUBE: ip trusted address list (make sure all provider signaling and media
> addresses are authorized or ip authentication is off (which I do not
> recommend) and make sure you include any CUCM addresses that are not used
> in dial peers).
>
> CUBE: double check your media and signal bindings and make sure they are
> binding correctly. Are you globally binding or dial peer binding?
>
> CUCM: verify the SIP trunk points to the CUBE interface that signaling is
> bound to (generally the same interface media would be bound to as well).
>
> CUBE:
> #logging buffered 10000000
> #enable debug ccsip messages
>
> Place a call and then look at the logs. Do you see any SIP error messages
> in the 4xx, 5xx (or more rare 6xx) range?
>
> As a quick gut check, if you can, enable “MTP Required” on the CUCM SIP
> trunk facing the CUBE (and make sure it has access to an MRGL/MRG that uses
> a CUCM node for MTP) and reset the trunk and test a call. If this works, it
> likely means you’re facing a network path issue between the phone’s IP
> network and the network of the CUBE interface facing CUCM.
>
> Outside of that, like Anthony said, it could be almost anything. A “sh
> run” or “sh tech” on the cube with a logging buffer from a ccsip messages
> during a failed call will generally get the ball rolling for most of us on
> this list in terms of offering targeted assistance.
>
> Thanks,
>
> Ryan
>
> On Feb 5, 2018, at 2:37 PM, Anthony Holloway <
> avholloway+cisco-voip at gmail.com> wrote:
>
> The fact that you received 2 packets is interesting.  Tells me that there
> is routing happening correctly...to some degree.
>
> If you go to the web page of the phone and click on stream 1, does the far
> end IP address match your CUBE address?
>
> Also, there's a lot of settings that need to be considered when
> implementing SIP, such as:
>
> Early Offer and MTP usage
> PRACK/Early Media
> Offfer/Answer (Capabilities)
> Interface Binding
> Transport Protocol
> OPTIONS Ping
> Duplex Streaming
> Midcall Signaling
> Timers
> etc.
>
> Depending on your setting, a lot of different possibilities exist for why
> you might have the experience you have.  If you could paint a clearer
> picture of your scenario, that might help out.
>
> On Fri, Feb 2, 2018 at 5:47 PM Jonatan Quezada <
> jonatan.quezada at chemeketa.edu> wrote:
>
> I get that this is usually routing but, is it also routing when the issue
>> is intermittent?
>>
>> our call flow is like so
>>
>> CentLink(Provider) ----siptrunk30Meg-PPP(IQ-private)---Cube---CUCM10.5,
>> uccx,unity
>>
>> <image.png>
>>
>> bonus facts, I have an operator who is in one of the two most affected
>> buildings and she can recover the call after hold, resume,hold,resume
>> sequence. then full rtp stream is there and she can hear and speak with
>> caller.
>>
>> are there SIP state change timers I can adjust, I want to tread lightly
>> though because out of all of our outreachs seperated by a metro ethernet
>> hub and spoke topology and almost 30 buildings here on main campus only 2
>> seem to be affected.
>>
>>
>>
>>
>>
>> --
>> For immediate assistance please reach out to Chemeketa IT Help Desk at
>> 5033997899 <(503)%20399-7899>
>> -or-
>> Visit the help center from your employee dashboard found here:
>> *https://dashboard.chemeketa.edu/helpcenter/default.aspx
>> <https://dashboard.chemeketa.edu/helpcenter/default.aspx>*
>>
>>
>> Johnny Q
>> Voice Technology Analyst - TelNet
>> Chemeketa Community College
>> Johnny.Q at chemeketa.edu
>> Building 22 Room 131
>> Work 5033995294 <(503)%20399-5294>
>> Mobile 9712182110 <(971)%20218-2110>
>> SIP 5035406686 <(503)%20540-6686>
>>
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