2N TELEKOMUNIKACE a.s., Modřanská 621, 143 01 Praha 4, Czech Republic, tel.: +420 261 301 500,
fax: +420 261 301 599, e-mail: sales@2n.cz, VAT No.: CZ2618396 www.2n.cz
2)
How to set up connection to the oposite device (PBX)
For the setting of the trunk between the VoiceBlue Next and your PBX you need to configure
SIP proxy (GSM→IP) for GSM incoming calls. SIP proxy (IP→GSM) is designed for secure
comunication just with traffic from your PBX. You can specify the IP address and port which
will accept SIP packets from.
In case you leave there 0.0.0.0 it will be open for all traffic.