DISA (Direct Inward System Access)

📖 Introduction

DISA allows users to dial into the phone system from an external phone and then make outbound calls as if they were in the office. The call appears to come from your office number.

How it works:

Call your DISA number from your cell phone
Enter your PIN
Dial any number as if you were at your desk
Caller ID shows your office number, not your cell

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🎯 Common Use Cases

Scenario	Benefit
Traveling executive	Call clients from office number
Remote worker	Use company trunks for long-distance
Mobile salesperson	Professional caller ID when on the road

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🖥️ Accessing the Module

Navigation: PBX → Applications → DISA

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📝 Form Fields

Field	Description	Example
Name	DISA line identifier	`Executive DISA`
Extension	Internal access number	`9999`
Caller ID Verification	Require calling from known number	`Yes`
Allowed Numbers	Caller IDs allowed (if verification on)	`+15551234567`
PIN Required	Require PIN entry	`Yes`
PIN	Access PIN	`123456`
Context	Dialplan context (usually default)	`default`
Enabled	DISA is active	`Yes`

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🚀 Practical Example: Executive DISA Access

Step 1: Create DISA Entry

Field	Value
Name	`CEO DISA`
Extension	`9999`
Caller ID Verification	`Yes`
Allowed Numbers	`+15558765432` (CEO's cell)
PIN Required	`Yes`
PIN	`654321`

Step 2: Create Inbound Route

Route a DID (e.g., +15559999999) to DISA extension 9999.

Step 3: How to Use

CEO calls +1-555-999-9999 from her cell
System recognizes her cell number
She enters PIN 654321
She dials the client number
Client sees office caller ID

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💡 Tips

TIP

Use Caller ID verification: Adds security layer.

WARNING

DISA is a security risk: If PIN is compromised, attackers can make calls on your account. Use strong PINs!

TIP

Link to Class of Service: Limit what numbers DISA users can dial.

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Inbound Routes — Route DID to DISA
Class of Services — Control DISA dialing permissions

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