Comprehensive Guide to Phone Numbers in Sudan

Quick Reference

• Country: Sudan
• Country Code: +249
• International Prefix: 00
• National Prefix: 0
• Regulatory Authority: National Telecommunications Corporation (NTC)

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Overview

Discover the intricacies of Sudan's telephone numbering plan, including number structures, dialing procedures, and technical considerations. This guide is essential for telecom professionals, developers, and anyone involved in Sudanese telecommunications.

Telephone Numbering Structure

General Number Structure

Sudan's telephone numbers are standardized by the National Telecommunications Corporation (NTC). The structure includes:

• Country Code: +249
• National (Significant) Number: 9 to 10 digits
  • Area Code/Network Code: 2 to 3 digits
  • Subscriber Number: 6 to 7 digits

Number Formats

Number Type	Format	Example
General Numbers	1[0-9]{8}	1912345678
Landline Numbers	1[58][35-7][0-9]{6}	1583456789
Mobile Numbers	1[0-2][0-9]{7} 9[0-3569][0-9]{7}	1201234567 9123456789
Toll-Free Numbers	800[0-9]{6}	800123456
Premium Numbers	900[0-9]{6}	900123456

Regular Expressions for Number Validation

• General Numbers:
  ^1[0-9]{8}$
  

• Landline Numbers:
  ^1[58][35-7][0-9]{6}$
  

• Mobile Numbers:
  ^1[0-2][0-9]{7}$|^9[0-3569][0-9]{7}$
  

• Toll-Free Numbers:
  ^800[0-9]{6}$
  

• Premium Numbers:
  ^900[0-9]{6}$
  

Dialing Procedures

Domestic Calls

• Landline to Landline: Dial the full number including the area code (e.g., 01587345678).
• Landline to Mobile: Dial the mobile number directly (e.g., 0912345678).
• Mobile to Mobile: Dial the mobile number directly (e.g., 0912345678).

International Calls

• Outgoing from Sudan: Dial 00 followed by the country code, area code, and the local number (e.g., 00244123456789).
• Incoming to Sudan: Dial +249 followed by the local number without the leading 0 (e.g., +249912345678).

Number Portability

Currently, Sudan does not support mobile number portability, meaning subscribers cannot retain their numbers when changing mobile operators.

Major Telecom Operators and Number Ranges

Operator	Number Range
Sudatel	091xxxxxxx
Zain Sudan	092xxxxxxx
MTN Sudan	099xxxxxxx
Canar Telecom	015xxxxxxx (Landline)

ITU-T Recommendations

Sudan's numbering plan complies with ITU-T Recommendation E.164, ensuring global uniqueness and dialability.

Number Allocation and Management

The National Telecommunications Corporation (NTC) manages the allocation of phone numbers, adhering to both national and international standards.

Technical Restrictions and Special Cases

• Golden Numbers: No formal policy for premium or "golden" numbers exists.
• Number Blocking: Certain numbers may be reserved for specific services, such as emergency or government use.

Technical Considerations for Developers

Key Points

1. Validation: Use the provided regex patterns to validate numbers.
2. Formatting: Store numbers in E.164 format for consistency.
3. Internationalization: Understand dialing procedures for international calls.
4. Number Length: Be aware of the 9 to 10 digit variability.