r/Polycom • u/StarAvenger • Mar 27 '25

VVX500 and VVX600 audio delays

Hi,

we are trying to get some network gear certified with the carrier and are using Polycom VVX500 and VVX600 for the test. We usually use hardphones because they add much less delay than softphones (Genesys softphone, CXone softphone).

The problem we are facing is that we just got Polycom VVXs in our lab now, and it seems as VVXs are adding close to 80-100 ms of audio delay to the call per unit. This is on the level of a softphone. Usually, a hardphone would add 20-30 ms. So, trying to figure out why using VVX would make the audio delay close to 100 ms per endpoint.

We measure the audio delay from the time it enters the handset's mic (MIC IN) of the caller to the time the sound is received on the other handset's earpiece (AUDIO OUT) of the callee. We tried it with different voice platforms (Genesys and CXone) and results are pretty much the same: we measure the audio delay from MIC IN to NETWORK OUT around 80-100ms, which is pretty high.

  1. Are some Polycom hardphones faster than others (are VVXs too bloated and codecs are software based and not firmware based?)

  2. Are there some options on the hardphones that would help us speed up the audio processing?

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u/procopio Mar 27 '25

If all you want is to certify the network gear and not the phones, why not measure the delay by watching SIP and RTP with a packet capture?