Session Manager Interface
Session Manager has two interfaces:
Management Interface (communication with SMGR): eth0
SM100 (Asset) Interface for SIP traffic: eth2
eth1 interface is used as Services port to connect you laptop directly.
It is only the eth2 port (SM100 port) which communicates to the SIP Entities (CM, 3rd Party PBX, SIP Trunk - service provider etc).
You would have to use SBC or Router (Firewall / NAT) to interact with ITSPs - Service providers. NAT is an option which you can use to interact external networks like ITSPs. NAT takes care of translating the internal private IP address to external public IP and vice versa.
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