Does the issue only occur on outbound calls to / from the PSTN?
Is the issue only on calls which use the SIP service, or does it affect calls which use the E1?
Assuming you're using Cisco phones with CUCM / CME, can you double tap the "?" mark on the Cisco phone and look for sent and receive packets and check if you lose any?
Alternatively, if you have Web Access enabled on the phone (assuming CUCM here), and go to Stream Statistics on an active call, this pulls up the same stats as pressing the "?", but you view the stats in your browser window instead.
Have you also issued a show call active voice on your gateway to check if any packets have been lost at all?
If you can rule out the first question, you can look at the other questions I asked.
IntroductionFeatured ExpertQ:Under what circumstances does it make sense to view "resource total" as opposed to "resource available" or vice versa?Q:Can that be sent to a Syslog server?Q:Is it possible to see when a device has changed, for example, if a ...
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Don't you just hate having to run RTMT in a virtual machine, well here it runs in an app for mac. I have complied a version for CUCM 14.x ( from a version I got for 11.x ) It works on older versions also. Here it is https://haffi.is/rt...
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