NuPoint Variable Packet Rate

[Jakt99]

NuPoint 16
vMCD 6.0
vMas 5.0
SIP trunks

Where in Nupoint configuration do you active below, its probably in front of my nose and can't see it. Problem I have is poor quality messages left in mailboxes by external callers. Call quaility on sip trunk is good, no complaints from users, only have issue with VM messages left so first looking down this path.......

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From Nupoint Engineering guidelines R6
Ethernet Packet Rates
NuPoint uses a fixed packet transmission rate of 20 ms. If an incoming call using a different
packet rate is streaming to NuPoint, it may result in distorted audio.

To allow NuPoint to accommodate packet rates other than 20 ms, the Administrator should
configure NuPoint for Variable Packet Rates. Details can be found in the NuPoint System
Administration Help (Where???). MCD supports variable packet rates at Release 4.0 and greater.
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[gweetz]

I had the same question... According to Mitel tech support, this feature is discontinued (since version 2.x). The problem is Mitel's documentation not being thoroughly reviewed and edited for new versions (among the OTHER problems of Mitel documentation!).

 

[Supernova99]

Variable packet rate can be enabled if required from default 20ms
However it will only be variable in conjunction with SIP trunking where it has also been adjusted from the standard 20ms
If using PRi ISDN trunks variable packet rate will not be active.

This was introduced in NPM 4.2

Below are notes from help

Symmetric RTP
Symptom: Your customer environment includes a 3300 Mxe controller with SIP Trunking. Calls placed to NuPoint UM appear to be answered, but no system prompts are heard as the call progresses.
Resolution: NuPoint UM uses the Real-time Transport Protocol (RTP) for audio streaming between the server and endpoints. By default, one UDP port is used to receive audio (RX) and another UDP port is used to transmit audio (TX) with a fixed packet rate of 20 ms.
In some SIP Trunking implementations, the same UDP port must be used both to transmit AND receive audio (commonly referred to as Symmetric RTP) using packet rates that are less common. In these environments, you need to change the Media Service Configuration to Variable Packet Rate.

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[Jakt99]

Thanks for advice all

Had also raised question to mitel support soon after posting here, which came back with same response and apologies, I hadn't got back earlier to post answer myself.

Issue finally resolved (plus fixed a couple of other quirky / frustrating things that were going on, that I wasn't made aware of at the time).....

The fix was to transfer the operation of sip trunks away from the corporate gateway / firewall solution and provision through MBG. Its a long, drawn out story which I wont bore all with..... Suffice it to say, always endeavour to provision MBG as the first choice gateway solution for SIP trunking, and others must raise a convincing arguement not to do so.........