[cisco-voip] Audio cut-through delays upon transfer

[Anthony Holloway]

Makes sense.

[image: image.png]


On Wed, Apr 11, 2018 at 1:19 PM Ryan Ratliff (rratliff) <rratliff at cisco.com>
wrote:

> Lost is a delta in sequence numbers from one packet to the next. If you
> never receive a first packet you can’t lose any.
>
> -Ryan
>
> On Apr 11, 2018, at 12:01 PM, Anthony Holloway <
> avholloway+cisco-voip at gmail.com> wrote:
>
> How does it show 0 packets received, but also 0 packets lost?  Somethings
> not right in the report from CMR.
>
> On Tue, Apr 10, 2018 at 10:48 PM James Andrewartha <
> jandrewartha at ccgs.wa.edu.au> wrote:
>
>> On 13/01/17 09:25, James Andrewartha wrote:
>> > We've experienced something similar for about 2.5 years, on some calls
>> > one party won't be able to hear audio for 5-10 seconds. These are all
>> > internal calls, single site, phones (7965 and 7975, SCCP) on a flat L2
>> > network, one pub, one sub. It even survived an upgrade from 8.6 to 10.5.
>> > We opened a case and TAC asked for a trace of it happening, but we
>> > couldn't reproduce it easily. I keep meaning to get back to it, but
>> > haven't had the time given how hard it is to reproduce.
>>
>> Well, some staff have moved to a demountable with a switch daisy-chained
>> from another and it's happening quite a bit now. Looking at the CDR I
>> can see that one end is just not receiving the packets. The phones are
>> on the same subnet/VLAN, and the switch ports have no errors. I'm going
>> to set up a span capture but does anyone have any suggestions on where
>> to look? CUCM 10.5.2.15900-8, 7975/7965 with SCCP[47]5.9-4-2SR2-2S.
>>
>> Parameter       Origination     Destination
>> MediaTransportAdd_Ip    10.100.254.227  10.100.253.223
>> PayLoadCapability       6       6
>> MediaCap_g723BitRate    0       0
>> Packets Sent    714     712
>> Octets Sent     122808  122464
>> Packets Received        711     0
>> Octets Received         122292  0
>> Packets Lost    0       0
>> Jitter  0       0
>> Latency         0       0
>> QoS     G       G
>> VideoCap_Codec  0       0
>> VideoCap_Bandwidth      0       0
>> VideoCap_Resolution     0       0
>> VideoTransportAddress_IP        0.0.0.0         0.0.0.0
>> VideoTransportAddress_Port      0       0
>>  --
>> James Andrewartha
>> Network & Projects Engineer
>> Christ Church Grammar School
>> Claremont, Western Australia
>> Ph. (08) 9442 1757
>> Mob. 0424 160 877
>> _______________________________________________
>> cisco-voip mailing list
>> cisco-voip at puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>
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