Public bug reported:

I am using network-manager 0.7~~svn20080908t183521+eni0-0ubuntu2 on an
Intrepid system.  I have a Verizon/Kyocera CDMA modem, and I the new NM
0.7 adds support for this modem.  This works pretty well -- NM is able
to connect to the network fine, and everything works.  The problem is
that the connection drops very frequently, generally after only a 2 or 3
minuts of use.  Prior to NM getting CDMA modem support, I had been using
my own ppp/chat scripts, and with that, the connection is quite stable
for at least an hour.

The only relevant-looking configuration that might explain the
diifference that I can find in ppp/peers file is

    lcp-echo-failure 0

the full file is:

    $ sudo cat /etc/ppp/peers/verizon
    ttyUSB0
    115200
    debug
    noauth
    defaultroute
    usepeerdns
    connect-delay 10000
    user ****
    show-password
    crtscts
    lock
    lcp-echo-failure 0

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
CDMA (cellular modem) connection drops often with network-manager
https://bugs.launchpad.net/bugs/268667
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