Silence at the beginning of a conversation with Yealink T48G and Yealink T46G

[Sonos]

Hello!

There are 2 Yealink T48G and Yealink T46G phones.
The T48G phone rings on the T46G, and the T46G hears silence for about 1 second, at which point the T48G is already talking.

Configured jitter buffer, set the type to fixed.
60
240
120

firmware T46G: 28.82.14.1
firmware T48G: 35.82.14.1

But it did not help.
The problem is floating and not clear.
I ask for help. Thank!