How to repeat the problem: assume we can connect to a provider using
"sudo pppd call xyz" command, i.e. we have a script /etc/ppp/peers/xyz
for connect.

Add "updetach" option to the script. Next, invoke:

    sudo pppd call xyz

The connection hangs up immediately after finish of the above "sudo" command. 
On the other hand, if you invoke:
    sudo bash
    pppd call xyz

the modem does not hang up.
Reason: call of setsid() function added by always_setsid patch. More info I 
wrote in Debian bug tracking system.

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https://bugs.launchpad.net/bugs/776193

Title:
  updetach option gives modem hangup

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