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<p>Indeed it does. Also it seems if you don't lose any packets after the first then the count is still zero. I managed to get a packet capture from one end and it looks fine, just 5 seconds later audio packets from the other end start showing up. On another
call I did see out of order and then retransmitted SCCP TCP packets during call setup which is a bit of concern, the only layer 3 device between the phones and CUCM is a 2921.<br>
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Parameter Origination Destination MediaTransportAdd_Ip 10.100.254.10 10.100.253.203 PayLoadCapability 6 6 MediaCap_g723BitRate 0 0 Packets Sent 14381 14381 Octets Sent 2473532 2473532 Packets Received 13870 14380 Octets Received 2385640 2473360 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
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<div class="PlainText">James Andrewartha<br>
Network & Projects Engineer<br>
Christ Church Grammar School<br>
Claremont, Western Australia<br>
Ph. (08) 9442 1757<br>
Mob. 0424 160 877</div>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>From:</b> Anthony Holloway <avholloway+cisco-voip@gmail.com><br>
<b>Sent:</b> Thursday, 12 April 2018 2:55 AM<br>
<b>To:</b> Ryan Ratliff (rratliff)<br>
<b>Cc:</b> James Andrewartha; cisco-voip list<br>
<b>Subject:</b> Re: [cisco-voip] Audio cut-through delays upon transfer</font>
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<div dir="ltr">Makes sense.
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<div dir="ltr">On Wed, Apr 11, 2018 at 1:19 PM Ryan Ratliff (rratliff) <<a href="mailto:rratliff@cisco.com">rratliff@cisco.com</a>> wrote:<br>
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<div style="word-wrap:break-word; line-break:after-white-space">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.
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<div>-Ryan </div>
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<div>On Apr 11, 2018, at 12:01 PM, Anthony Holloway <<a href="mailto:avholloway+cisco-voip@gmail.com" target="_blank">avholloway+cisco-voip@gmail.com</a>> wrote:</div>
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<div dir="ltr">How does it show 0 packets received, but also 0 packets lost? Somethings not right in the report from CMR.</div>
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<div dir="ltr">On Tue, Apr 10, 2018 at 10:48 PM James Andrewartha <<a href="mailto:jandrewartha@ccgs.wa.edu.au" target="_blank">jandrewartha@ccgs.wa.edu.au</a>> wrote:<br>
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On 13/01/17 09:25, James Andrewartha wrote:<br>
> We've experienced something similar for about 2.5 years, on some calls<br>
> one party won't be able to hear audio for 5-10 seconds. These are all<br>
> internal calls, single site, phones (7965 and 7975, SCCP) on a flat L2<br>
> network, one pub, one sub. It even survived an upgrade from 8.6 to 10.5.<br>
> We opened a case and TAC asked for a trace of it happening, but we<br>
> couldn't reproduce it easily. I keep meaning to get back to it, but<br>
> haven't had the time given how hard it is to reproduce.<br>
<br>
Well, some staff have moved to a demountable with a switch daisy-chained<br>
from another and it's happening quite a bit now. Looking at the CDR I<br>
can see that one end is just not receiving the packets. The phones are<br>
on the same subnet/VLAN, and the switch ports have no errors. I'm going<br>
to set up a span capture but does anyone have any suggestions on where<br>
to look? CUCM 10.5.2.15900-8, 7975/7965 with SCCP[47]5.9-4-2SR2-2S.<br>
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Parameter Origination Destination<br>
MediaTransportAdd_Ip 10.100.254.227 10.100.253.223<br>
PayLoadCapability 6 6<br>
MediaCap_g723BitRate 0 0<br>
Packets Sent 714 712<br>
Octets Sent 122808 122464<br>
Packets Received 711 0<br>
Octets Received 122292 0<br>
Packets Lost 0 0<br>
Jitter 0 0<br>
Latency 0 0<br>
QoS G G<br>
VideoCap_Codec 0 0<br>
VideoCap_Bandwidth 0 0<br>
VideoCap_Resolution 0 0<br>
VideoTransportAddress_IP 0.0.0.0 0.0.0.0<br>
VideoTransportAddress_Port 0 0<br>
--<br>
James Andrewartha<br>
Network & Projects Engineer<br>
Christ Church Grammar School<br>
Claremont, Western Australia<br>
Ph. (08) 9442 1757<br>
Mob. 0424 160 877<br>
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