[asterisk-users] lost packets when bridging zap and iax

[Simone Cittadini]

We have a machine with a TE410P in it acting as a client to route calls 
via iax2 to our central server,

caller --> ( zap -> iax ) ---> ( iax -> whatever ) --> called
                 client                  server

often the called can't hear the caller (both machines on public ip)
'iax2 show netstats" on client machine shows more and more dropped 
packets on the local side

if we use sip as the "entering point" for the calls all works well :

caller --> ( sip -> iax ) ---> ( iax -> whatever ) --> called
                 client                  server

seems something in the bridging between zap and iax screws up, but I 
don't know if it's a bug or a misconfiguration, my conf files follows, 
someone has similar experiences to share ?

/etc/asterisk# cat iax.conf

[general]
bindport=4569
bindaddr=xxx.xx.xx.xxx

disallow=all
allow=alaw

jitterbuffer=yes
forcejitterbuffer=no

tos=lowdelay
autokill=yes

language=it
notransfer=yes


/etc/asterisk# cat sip.conf

[general]

context=invalid

bindport=5060
bindaddr=xxx.xx.xx.xxx

srvlookup=no

disallow=all
allow=alaw

progressinband=no
canreinvite=no

language=it

[authentication]

[some-ip]
type=friend
context=ip
host=some-ip


/etc/asterisk# cat zapata.conf

[channels]
language=it
context=default

switchtype=euroisdn
pridialplan=national
prilocaldialplan=national
signalling=pri_cpe
immediate=no

callerid=asreceived
usecallingpres=yes

echocancel=yes
echocancelwhenbridged=no
;echotraining=yes

rxgain=0.0
txgain=0.0

group=1
callgroup=1
pickupgroup=1

group = 1
channel => 1-15
channel => 17-31

channel => 32-46
channel => 48-62

channel => 63-77
channel => 79-93

channel => 94-108
channel => 110-124


/etc/asterisk# cat /etc/zaptel.conf

span=1,1,0,ccs,hdb3
bchan=1-15
dchan=16
bchan=17-31

span=2,1,0,ccs,hdb3,crc4
bchan=32-46
dchan=47
bchan=48-62

span=3,1,0,ccs,hdb3
bchan=63-77
dchan=78
bchan=79-93

span=4,1,0,ccs,hdb3
bchan=94-108
dchan=109
bchan=110-124

loadzone=it
defaultzone=it