Impove perfomance red5phone

Hi all

i’ve installed openfire+red5 plugin with sip

everything works perfectly, but if i use it in week channel, it chops… is there way to improve perfomance? current setting are(taken from sip.conf:

debug_level=8

log_path=…/logs

max_logsize=2000

keepalive_time=8000

accept_time=0

hangup_time=20

audio=yes

audio_port=3000

audio_avp=0

audio_codec=PCMU

audio_sample_rate=8000

audio_sample_size=1

audio_frame_size=256

Thank you in advance