PSTN Forwarding

PSTN Forwarding allows you to forward calls from your FlyNumber to any regular phone number. Once you set up a route, you can use it anywhere in your call flow within the Ring Group module or Queue module.

Routing Options

See Routing Options for two ways to configure how calls reach your phone number - either direct assignment or through call flows.

For simple forwarding needs, assign a FlyNumber directly as the DID Number to configure everything without creating call flows on the panel. Just select your FlyNumber and enter the destination phone number to get started.

note

There is a phone system specific per-minute rate when forwarding calls to regular phone numbers.

Interface Fields

Field	Description
Destination Number	The phone number receiving forwarded calls
User	Name of the user this route is assigned to
Number	FlyNumber used for inbound calls
Internal number	Extension for internal calling
When unavailable	Action taken when destination is unreachable
Allow Call Transfer	Indicates if call transfer is enabled

tip

You can drag columns left or right to rearrange them in any order you prefer. You can also download your PSTN forwarding configuration by clicking the download icon in the top right corner.

Caller ID Behavior

When forwarding calls to regular phone numbers through PSTN forwarding, the system passes along the caller ID of the person calling your FlyNumber. However, there are some important considerations:

Anonymous Call Handling

When someone calls your FlyNumber with a blocked or anonymous caller ID, the call might not connect when forwarding to a regular phone number. This is due to carrier policies regarding anonymous calls.

This can happen with calls that have:

• No caller ID (CLI)
• Invalid caller ID
• Manipulated caller ID
• Anonymous, blocked, or private numbers
• Caller IDs not matching international standards

Solutions for Anonymous Calls

To ensure you receive all calls, including those with blocked caller IDs, you have two options:

1. Use SIP Forwarding: Instead of PSTN forwarding, set up SIP Forwarding to handle calls. SIP connections always forward calls regardless of caller ID status.

2. Create Fallback Routes: Use the phone system's Ring Group module to set up multiple destinations:

   • Configure both PSTN and SIP destinations
   • Set up sequential ringing to try alternate routes
   • Use VoIP as a backup for failed PSTN connections

tip

For business-critical numbers where you can't miss any calls, we recommend using SIP or the phone system app instead of PSTN forwarding to ensure all calls connect successfully.

Creating PSTN Forwarding

To create new PSTN forwarding:

1. Click the + button in the bottom right corner
2. Configure the following settings:

General Settings

Configure the basic settings:

• User: Select the user who will own this route
• Phone number: Enter the destination number in E.164 format:
  • No + symbol, 011, or 00 prefix
  • Include country code and full number
  • Examples:
    • UK: 44405551212
    • USA: 12125551212
• Allow Call Transfer: Enable to allow callers to transfer calls
  warning

  Enabling call transfers may incur additional per-minute charges for the transferred calls.

Call Transfers

PSTN forwarding supports call transfers when enabled. See Call Transfers for details on attended and unattended transfers.