Network Caller ID

I periodically see this error in /var/log/ncidd.log:

---
Started: 09/22/2006 10:05
Server: ncidd 0.66
Processed config file: /etc/ncid/ncidd.conf
Configured to send 'cidlog' to clients.
Configured to send 'cidinfo' to clients.
Processed alias file: /etc/ncid/ncidd.alias
Verbose level: 3
CID logfile: /var/log/cidcall.log
Data logfile: /var/log/ciddata.log
TTY port opened: /dev/ttyS1
TTY port speed: 19200
TTY lock file: /var/lock/LCK..ttyS1
TTY port control signals enabled
AT&FE1V1Q0+VIP^M^M
OK
Try 1 to init modem: return = 0.
Modem initialized.
AT+VCID=1^M^M
OK
Modem set for CallerID.
Device Hung Up, Terminated 09/22/2006 10:09
---

If I restart ncidd, it starts fine. Running Fedora
Core 4, kernel 2.6.17-1.2142_FC4.