We appear to be having a problem with our asterisk setup.
We have a cisco AS5300 with pri lines coming in and passing the calls onto
asterisk then too the sip phones.
the phone call from the sip phones (7960's) appears to be ok nice and clear
including the user who has called in.
but if your the user who has called in its all crackley sounds really bad
when they speak.
i believe this problem is a codec problem as far as i can see we use ulaw
across the board, the 5300 currently supports 12 different codecs however
asterisk only like too work with ulaw or alaw it tends to not except the
call if the other codecs are used.
clear-channel Clear Channel 64000 bps
g711alaw G.711 A Law 64000 bps
g711ulaw G.711 u Law 64000 bps
g723ar53 G.723.1 ANNEX-A 5300 bps
g723ar63 G.723.1 ANNEX-A 6300 bps
g723r53 G.723.1 5300 bps
g723r63 G.723.1 6300 bps
g726r16 G.726 16000 bps
g726r24 G.726 24000 bps
g726r32 G.726 32000 bps
g728 G.728 16000 bps
g729br8 G.729 ANNEX-B 8000 bps
g729r8 G.729 8000 bps
