Solved snom m65s/M700 + 3CX: upgrading to 16 causes delay after pickup

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atriebsees

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Hello and a Good Day,

We've got a a setup of 10 M700 and 40 M65 and have recently upgraded our 3CX from V15.5 to 16 and ever since our snom handsets express some rather strange behaviour.
There's been a change in call quality (both outbound and internal) even though we did not explicitly change any audio codec settings, neither on the 3CX nor in the M700s directly. I've been testing and switching the order of the codecs (711U/711A/722 etc) but nothing seems to really help.
But the biggest bugger ist the delay when a line is opened. The handsets are indicating that something is in happening in "HD", at least that's what it says in the display. When someone picks up the phone it takes up to 1,5 seconds until the connection has actually been established and the "HD" appears in the display. During that time the connection is not usable/dead. That's rather irritating.
Before it was an instant experience - you picked up the phone, you could talk or listen. Now you have to wait and people are complaining.

I am having a hard time identifying the root cause of this. I suspect that it's somehow connected to the codec settings, but...what does the "HD" actually indicate? A specific (group of) codec(s) being used? Or some other setting in the 3CX?
If anyone could point me in the right direction i'd be pretty grateful!



best
alex
 
Certainly sounds (no pun intended), like a Codec issue of some sort. I would begin by limiting the sets codec choice to one, perhaps G711 a or U, whichever is used by your provider. See if the issue still happens, then add some additional codecs until it re-occurs.
 
Hello,

it seems like it's more of a compatibility problem than a specific codec order issue. We've gotten in touch with the 3CX support and they suggested upgrading the snoms to a more recent firmware. So i've updated the M700s and the M65 to 410B14/B11 and that somehow fixed the problem. The "HD" disappeared from the handset's displays and the delay was gone. Audio quality also improved.
 
Hi,

I'm glad this was resolved
 
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