Asterisk 1.4.4 crash

I have fresh installed asterisk 1.4.4 with 3 sip clients.
when dialing for 2nd or 3nd time between sip clients asterisk crashes.
asterisk from svn crashes too
any help?

the bt from the core file follows

#0 0x0807d500 in ast_channel_alloc (needqueue=1, state=0,
cid_num=0x813dec0 “”, cid_name=0x813dec0 “”,
acctcode=0xb73e5f40 “SIP/%s-%08x”, exten=0xb6cb1f1b “sip2”,
context=0x81b9e08 “”, amaflag=1802725746,
name_fmt=0x4 <Address 0x4 out of bounds>)
at /root/src/asterisk-1.4.4/include/asterisk/strings.h:35
#1 0xb73980cd in sip_new (i=0x81b9e08, state=0, title=)
at chan_sip.c:3743
#2 0xb73c9195 in sip_request_call (type=0xb6cb20e0 “SIP”,
format=, data=0xb6cb2db4, cause=0xb6cb2ecc)
at chan_sip.c:15161
#3 0x0807b4d7 in ast_request (type=0xb6cb20e0 “SIP”, format=8,
data=0xb6cb2db4, cause=0xb6cb2ecc) at channel.c:3092
#4 0xb708a7f3 in dial_exec_full (chan=0x81b9610, data=,
peerflags=0xb6cb2f04) at app_dial.c:1078
#5 0xb708f6db in dial_exec (chan=0x81b9610, data=0xb6cb6fd8)
at app_dial.c:1657
#6 0x080c48c1 in pbx_extension_helper (c=0x81b9610, con=0x0,
context=0x81b9790 “default”, exten=0x81b97e0 “51”, priority=1, label=0x0,
callerid=0x81a7fa8 “sip3”, action=E_SPAWN) at pbx.c:532
#7 0x080c6596 in __ast_pbx_run (c=0x81b9610) at pbx.c:2288
#8 0x080c752e in pbx_thread (data=0x81b9610) at pbx.c:2601
#9 0x080f2d2b in dummy_start (data=0x81a8118) at utils.c:545
—Type to continue, or q to quit—
#10 0xb7f7b34b in start_thread () from /lib/
#11 0xb7da865e in clone () from /lib/

asterisk 1.4.3 works fine