TruSIP SIP Trunks connected to a NEC SL1100 or SL2100
The PBX requires 2 x Private IP Addresses according to RFC1918. These two addresses should be outside the DHCP Scope of the LAN. The organisation that manages the local network would typically assign these two addresses and relay the information onto the organisation that manages the firewall.
- IP Address "A" is used for SIP Signalling
- IP Address "B" is used for RTP Media
Additionally sufficient capacity within the DHCP Scope for use by End User Devices should be available. Depending on the size of the installation a considerable quantity of hosts could be connected to the LAN. A voice VLAN might be desirable in this circumstance.
The following rules must be configured on the network firewall.
It is essential that SIP ALG is disabled. (also known as SIP Transformation, SIP Helper or SIP Inspection)
Source IP Address | Source Ports | Destination IP Address | Destination Ports |
185.163.68.0/24 | UDP 5060 | IP Address "A" | UDP 5060 |
185.163.68.0/24 | UDP 10000 - 20000 | IP Address "B" | UDP 10020 - 10277 |
185.163.70.0/24 | UDP 5060 | IP Address "A" | UDP 5060 |
185.163.70.0/24 | UDP 10000 - 20000 | IP Address "B" | UDP 10020 - 10277 |
46.102.218.72/29 | TCP 1024 - 65535 | IP Address "A" | TCP 8000 + 35300 - 35301 |
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