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The attached diagram provides a simplified architectural view of the network topology used to perform interoperability between Primelink and Sipxecs:
Primelink uses Metaswitch's softswitch and session border controller (SBC) technologies for the delivery of IP-based telephony to business customers. Optical Line Terminals (OLT) at the Primelink central office terminates the fiber access from multiple customers and front-ends the Metaswitch voice switching infrastructure. The Metaswitch SBC acts as a Back-to-Back User Agent (B2BUA) for the softswitch as well as upstream IP-based long-distance carriers. Local and long-distance TDM-based PSTN traffic is converted to IP via media gateways connected to the Metaswitch softswitch.
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Go to Devices > Gateways and select the option to build a SIP Trunk. From the Configuration menu provide the name of the gateway trunk, IP address of the Metaswitch SBC, SIP port and protocol to be used in sending SIP signaling traffic to Primelink.
In the Gateway > Caller ID menu, provision the default callerid to be used for outgoing calls. The Metaswitch SBC can be configured to make this callerid a DID not assigned to the SIP trunk – this can be useful when doing live testing of Sipxecs using temporary SIP trunks while leaving the existing PBX infrastructure in place.
Go the Gateway > ITSP Account menu and specify the authentication number (normally the billing number) provided by Primelink in the Username field. Leave the Register on Initialization radio button unchecked. Click on advanced settings, and coordinate the Session Timer Interval setting with Primelink – the session timer interval setting in the Sipxecs trunk gateway setting needs to match the setting defined in the Metaswitch SBC.
Step 3 – NAT Traversal Setting
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- Set NAT traversal address type to ‘Specify IP Address” from Stun
- Set the Public IP Address to the IP address of Metaswitch SBC provided by Primelink
Step 4 – Validate Sipxbridge External Port Setting
Go to the Devices > Sipxbridge menu and ascertain that the external port setting for the internal Sipxbridge SBC is set to 5080.
Other Considerations
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Provisioning the VLAN address in the Phone > Network configuration profile bypassed the switch LLDP discovery and resolved the issue.
