Cisco Call Manager connected to Asterisk Server (Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz)x12, RAM 32GB. Conference app is confbridge. Voice quality is dropping after ~160 people with g729 and ~70 with ulaw. At the same time if we call from asterisk sip account (using zoiper) than voice quality is good for other participants.
What can be the issue ? Thanks
Issue was inside CUCM (Cisco Call Manager) it had limit in bandwidth of 20Mb/sec so we couldn't handle more people in single room.