GSM Modem "freezes"

Hi,

 

We are using the latest Kannel CVS with a Wavecom WMOD2, dual band to
receive SMSs for a client.

 

After a few days the GSM modem seems to always "freeze" and does not receive
any more SMSs until we manually restart Kannel.

This means we can't provide a reliable service to our client that requires
SMSs to be received by a GSM Modem.

What is interesting is even when the modem does not accept any more SMSs, we
still see in the bearerbox.log 

 

2008-02-19 04:13:06 [12603] [15] DEBUG: AT2[gsmmodem1]: <--
AT+CNMI=1,2,0,1,1

2008-02-19 04:13:06 [12603] [15] DEBUG: AT2[gsmmodem1]: <-- OK

 

Is this a bug in the Kannel AT code?

Any suggestions to prevent this happening and to improve our configuration
below are most appreciated.

 

The following is the configuration used:

 

gsmmodem1.conf:

group = smsc

smsc-id = gsmmodem

allowed-smsc-id = gsmmodem

smsc = at

modemtype = wavecom

validityperiod = 167

my-number= +27xxxxxxxxx

sms-center = +27831000113

#sim-buffering = true

keepalive= 120

device = /dev/ttyS0

speed = 9600

 

modems.conf:

group = modems

id = wavecom

name = "wavecom"

detect-string = "WAVECOM"

init-string = "AT+CNMI=1,2,0,1,1"

reset-string = "AT+CNMI=1,2,0,1,1"

speed = 9600

need-sleep = true

message-storage = "SM"

sendline-sleep = 150

keepalive-cmd = "AT+CNMI=1,2,0,1,1"

 

group = sms-service

accepted-smsc=gsmmodem

keyword = default

get-url = "http://
xxx:xxx@localhost/gsmmodem?from=%p&to=%P&message=%a&timesent=%t&smsc=%i"

omit-empty= true

max-messages = 0