From this out put, you can see one g711ulaw call use 15 credits, but other 2 calls use 22 credits, why?
router1#sh voice dsp group all
DSP groups on slot 0:
dsp 1:
State: UP, firmware: 26.8.0
Max signal/voice channel: 32/32
Max credits: 480
num_of_sig_chnls_allocated: 32
Transcoding channels allocated: 0
Group: FLEX_GROUP_VOICE, complexity: FLEX
Shared credits: 190, reserved credits: 0
Signaling channels allocated: 32
Voice channels allocated: 13
Credits used (rounded-up): 290
Voice channels:
Ch01: voice port: 0/1/0:15.29, codec: g711ulaw, credits allocated: 15
Ch02: voice port: 0/1/0:15.31, codec: g711ulaw, credits allocated: 22
Ch03: voice port: 0/0/0:15.1, codec: g729br8, credits allocated: 22
Ch04: voice port: 0/0/0:15.3, codec: g729br8, credits allocated: 22
Ch05: voice port: 0/0/0:15.4, codec: g729br8, credits allocated: 22
Ch06: voice port: 0/0/0:15.6, codec: g729br8, credits allocated: 22
Ch07: voice port: 0/0/0:15.5, codec: g729br8, credits allocated: 22
Ch08: voice port: 0/0/0:15.7, codec: g729br8, credits allocated: 22
Ch09: voice port: 0/1/0:15.28, codec: g729br8, credits allocated: 22
Ch10: voice port: 0/0/0:15.9, codec: g729br8, credits allocated: 22
Ch11: voice port: 0/0/0:15.2, codec: g729br8, credits allocated: 22
Ch13: voice port: 0/1/0:15.30, codec: g729r8, credits allocated: 22
Ch14: voice port: 0/1/0:15.27, codec: g711ulaw, credits allocated: 22
Slot: 0
Device idx: 0
PVDM Slot: 0
Dsp Type: SP2600