XLinux PPP: wvdial 終了コード 16 デバッグの詳細なし

私はRapsbian RPiで3G USBモデムを試してみましたが、何らかの理由でPPPが終了コード16に切断されたことを除いて、すべてうまくいきました。デバッグモードを有効にしたが認証が成功した以外は何も表示されません。

以下の詳細をご覧ください。

 WvDial: Internet dialer version 1.61
 Initializing modem.
 Sending: ATZ
ATZ
OK
 Sending: AT+CPIN=XXXX
AT+CPIN=XXXX
OK
 Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
 Sending: AT+CGDCONT=1,"IP","internet"
AT+CGDCONT=1,"IP","internet"
OK
 Modem initialized.
 Sending: ATD*99#
 Waiting for carrier.
ATD*99#
CONNECT 3600000
 Carrier detected.  Starting PPP immediately.
 Starting pppd at Sun Dec  7 22:23:20 2014
 Pid of pppd: 2967
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 Using interface ppp0
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 Authentication (CHAP) started
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 Authentication (CHAP) successful
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
 Disconnecting at Sun Dec  7 22:23:24 2014
 The PPP daemon has died: A modem hung up the phone (exit code = 16)
 man pppd explains pppd error codes in more detail.
 Try again and look into /var/log/messages and the wvdial and pppd man pages for more information.
 Auto Reconnect will be attempted in 5 seconds

/var/log/messages は以下を示しています:

Dec  7 22:58:45 raspberrypi pppd[3779]: pppd 2.4.5 started by root, uid 0
Dec  7 22:58:45 raspberrypi pppd[3779]: Using interface ppp0
Dec  7 22:58:45 raspberrypi pppd[3779]: Connect: ppp0 <--> /dev/ttyUSB2
Dec  7 22:58:45 raspberrypi pppd[3779]: CHAP authentication succeeded
Dec  7 22:58:45 raspberrypi pppd[3779]: CHAP authentication succeeded
Dec  7 22:58:48 raspberrypi pppd[3779]: Modem hangup
Dec  7 22:58:48 raspberrypi pppd[3779]: Connection terminated.
Dec  7 22:58:48 raspberrypi pppd[3779]: Exit.