Segfault Error 11

My Asterisk 1.6.0.6 installation has been restarting on it's own every couple of days for about 3 weeks. I've been unable to find anything that was causing it until this morning.

I configured a couple of new extensions yesterday through the Thirdlane MTE v 6.0.1.81. Any time one of those new extensions attempts to check voicemail the Asterisk daemon restarts.

This new extension is a two-digit extension, I don't know if that will cause a problem, but this is the first two-digit extension I've configured, so that can't be the whole problem.

I've tried following the instructions at http://www.voip-info.org/wiki/view/Asterisk+debugging. The backtrace appears, at least to me, pretty useless. Here's the tail end...

---Type to continue, or q to quit---
Thread 11 (Thread 27342):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 10 (Thread 27356):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 9 (Thread 27426):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 8 (Thread 27442):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 7 (Thread 27579):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 6 (Thread 28786):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 5 (Thread 28989):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 4 (Thread 29052):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 3 (Thread 29072):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 2 (Thread 29256):
#0 0x00429402 in __kernel_vsyscall ()
#1 0x00388023 in ?? ()

Thread 1 (Thread 26092):
#0 0x080850c6 in ?? ()
(gdb) quit

When I try to debug use gdb and debug Asterisk realtime, it's almost like I lock up the process. I'm unable to make or receive calls and occasionally my phone has lost registration.

Any help is appreciated.
(x-posted)