h323 <-> SIP call established, no voice

I am using *Now
I can call succesfully between SIPs
But when I place a call between SIP and H323 I have no voice
The log messages are
Dec 3 17:33:18] DEBUG[3053] rtp.c: RTP Transmission error of packet 19838 to 192.168.0.74:16384: Invalid argument

The call are between 205 and 208 extensions
The H323 extension is a Welltech analog gateway
The SIP extension is a X-LITE

h323.conf
[192.168.0.74]
type=friend
host=192.168.0.74
context=test
[general]
port=1720
bindaddr=0.0.0.0
disallow=all
allow=ulaw
dtmfmode=inband
gatekeeper=DISABLE
context=test

sip.conf

[208]
type=friend
context=test
host=dynamic
[general]
context=test
allowoverlap=no
bindport=5060
bindaddr=0.0.0.0
srvlookup=yes
disallow=all
allow=ulaw
canreinvite=NO

extension.conf
[general]
static=yes
writeprotect=no
autofallthrough=yes
clearglobalvars=no
priorityjumping=no


[test]
exten=208,1,dial(SIP/208)
exten=205,1,dial(H323/205@192.168.0.74)