T58A to Cisco IP Phone Video Size Problem

[nolto]

Hello All,

One of our customers using Cisco added Yealink T58A IP Phones to their existing structure.

For the video calls, there is no problem
From Yealink to Yealink or,
from Cisco to Cisco or,
from Cisco to Yealink,
But video calls from Yealink T58A to Cisco IP Phone, Video size is too small.

Could you please suggest for resolve this issue?

Thanks
Emre (Nolto Bilişim)