At an installation, the SIP call was getting established, but the speech began after some delay.
We found the ping to also be slow.
Below were the network settings at the PBX server.
Subnet - 192.168.1.0/24
ip address- 192.168.1.118
gateway- 192.168.1.1
name server 8.8.8.8, 4.4.4.4
The problem...