120 DSP used when only 60 calls are made

Hi!
I have a AS5300 which is used to terminate voip traffic. It has 3 E1 ISDN PRI connection to PSTN, and it *seems* it has 120 codecs available. But this router is unable to handle more than 60 calls simultaneously.
This is output from 'show call resource voice stats':
Resource Monitor - Dial-up Resource Statistics Information:
DSP Statistics:
Utilization: 100.00 percent
Total channels: 120
Inuse channels: 120
Disabled channels: 0
Pending channels: 0
Free channels: 0
DS0 Statistics:
Utilization: 0.00 percent
Total channels: 124
Addressable channels: 0
Inuse channels: 0
Disabled channels: 0
Free channels: 0
It shows that 120 DSPs are used, though there are only 60 calls. 'show version' shows '60 DSP(s), 120 Voice resource(s)'. I have another AS5300 with 4 E1 PRI and it handles up to 110 calls.
What's wrong?
P.S. IOS is 12.3(18), VCWare Version: 11.41, DSPWare Version: 4.1.41, Technology: C549.

Hi
Sounds like your gateway is using g729 (compressed codec) - this uses much less bandwidth (8k payload instead of G711's 64K payload) at slightly lower quality...
Do a:
show dial-pee voice | i eer|codec
This should show what codec each peer is set to - the default is G729.
If you are running voice over high bandwidth or a LAN you may want to change this to save on DSPs...
You'll probably need to change the codec on your AS5300 and on the other end of the call leg...
Regards
Aaron
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