GPRS with Nokia 9300i, Gentoo and China mobile (2, OpenRC)

Since I moved my laptop to the new OpenRC init framework, my GPRS connection stopped working. At first I didn’t know what needed to be changed, but after having a careful look at /usr/share/doc/openrc/net.example and adjusting the proposed ppp chat script, I got it up and running again. Here is my configuration:

### GPRS ###

config_ppp0=( "ppp" )

link_ppp0="/dev/rfcomm0"

pppd_ppp0=(
        "noauth"        # Do not require the peer to authenticate itself
        "debug"
        "local"         # Ignore carrier detect signal from the modem

        "defaultroute"  # Make this PPP interface the default route
        "usepeerdns"    # Use the DNS settings provided by PPP

        "lcp-echo-interval 15"  # Send a LCP echo every 15 seconds
        "lcp-echo-failure 3"    # Make peer dead after 3 consective
                                                        # echo-requests

        "lock"                          # Lock serial port
        "115200"                        # Set the serial port baud rate
        "crtscts"                       # Enable hardware flow control
)

chat_ppp0="
ABORT BUSY
ABORT ERROR
ABORT 'NO ANSWER'
ABORT 'NO CARRIER'
ABORT 'NO DIALTONE'
ABORT 'Invalid Login'
ABORT 'Login incorrect'
'' AT
TIMEOUT 5
OK 'ATH'
OK 'ATE1'
OK 'AT+CGDCONT=1,\"IP\",\"cmnet\"'
OK 'ATD*99#'
TIMEOUT 60
CONNECT ''
TIMEOUT 5
~-- ''
"