SIP Trunk Connection Requirements

The following connection method applies depending on whether the SIP proxy feature is used and whether the provider operates on a private network:

1. When using the SIP proxy feature with a private SIP trunk provider
   The SIP trunk must be connected via the LAN port.
   → See document: SIP Trunk On LAN Port.pdf

2. For all other SIP trunk connections (without SIP proxy or with a non‑private provider)
   The SIP trunk must be connected via the WAN port.
   → See document: *V4-SipTrunk.pdf*