[시장보고서]세계의 VoIP 서비스 시장 : 산업 분석, 규모, 점유율, 성장, 동향 및 예측(2025- 2032년)

세계의 VoIP 서비스 시장 : 산업 분석, 규모, 점유율, 성장, 동향 및 예측(2025- 2032년)

VoIP Services Market: Global Industry Analysis, Size, Share, Growth, Trends, and Forecast, 2025 - 2032

상품코드 : 1623923

리서치사 : Persistence Market Research

발행일 : 2025년 01월

페이지 정보 : 영문 169 Pages

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한글목차

주요 인사이트

VoIP 서비스 시장 규모(2025년) : 1,669억 4,790만 달러
시장 규모 예측(2032년) : 4,188억 3,620만 달러
세계 시장 성장률(2025-2032년) : CAGR 14.0%

시장 성장 촉진요인:

세계 VoIP 서비스 시장을 주도하는 몇 가지 주요 요인이 있습니다. 기업 및 개인들 사이에서 비용 효율적인 통신 솔루션에 대한 수요가 증가하면서 시장 성장을 견인하고 있으며, 5G 네트워크 구축과 같은 인터넷 인프라의 기술 발전은 VoIP 서비스의 품질과 안정성을 향상시켜 시장 확대를 더욱 촉진하고 있습니다. 또한, 통합 커뮤니케이션(UC) 시스템 및 원격 근무 환경에 대한 요구가 증가하면서 VoIP 서비스 도입이 가속화되고 있으며, AI 기반 분석 및 협업 도구와의 통합과 같은 혁신적인 기능의 도입과 함께 R&D 활동이 강화되어 다양한 사용자층에 맞는 솔루션을 제공함으로써 시장 성장에 기여하고 있습니다. 다양한 사용자층에 맞는 솔루션을 제공함으로써 시장 성장에 기여하고 있습니다.

시장 성장 억제요인 :

유망한 성장 전망에도 불구하고, VoIP 서비스 시장은 보안 문제 및 복잡한 규제와 관련된 문제에 직면해 있습니다. 데이터 유출 및 VoIP 사기와 같은 사이버 보안 위협은 잠재적인 사용자들의 발길을 돌리게 하고 시장 확대에 걸림돌이 될 수 있습니다. 또한, 기존 전화, OTT 등 대체 통신 솔루션의 등장으로 VoIP 서비스에 대한 경쟁이 심화되고 있습니다. 인터넷 인프라가 부족한 지역에서는 통화 품질에 대한 우려가 더욱 큰 문제로 대두되고 있습니다. 이러한 문제를 해결하기 위해서는 고급 보안 프로토콜에 대한 지속적인 투자, 규제에 대한 대응, 인터넷 연결이 부족한 지역에서의 인터넷 연결 개선이 필요합니다.

시장 기회 :

모바일 VoIP 서비스 도입 확대와 AI 및 블록체인과 같은 첨단 기술의 통신 플랫폼 통합으로 인해 이 시장은 큰 기회를 맞이하고 있습니다. 현장과 원격지의 요구를 모두 충족시킬 수 있는 강력한 하이브리드 통신 솔루션의 개발은 새로운 소비자 취향에 부합합니다. 신흥 시장에서의 VoIP 서비스 확대는 스마트폰과 인터넷 접속의 확산에 힘입어 큰 성장 잠재력을 가지고 있습니다. 이러한 기회를 활용하고 시장 리더십을 유지하기 위해서는 전략적 파트너십, 혁신 기술에 대한 투자, 맞춤형 통신 패키지를 도입하는 것이 필수적입니다.

세계의 VoIP 서비스 시장을 조사했으며, 시장 정의와 개요, 시장 성장 촉진요인 및 억제요인, 각종 동향, 시장 기회와 과제, 시장 규모(금액 및 일부 수량) 추이와 예측, 각종 부문별/지역별/주요 국가별 상세 분석, 경쟁 환경, 주요 기업 프로파일 등의 정보를 정리하여 전해드립니다.

영문목차

Persistence Market Research has recently published an extensive report on the global VoIP Services Market. This report offers a comprehensive analysis of the key market dynamics, including drivers, trends, opportunities, and challenges, providing deep insights into the market structure.

Key Insights:

VoIP Services Market Size (2025E): USD 166,947.90 Mn
Projected Market Value (2032F): USD 418,836.20 Mn
Global Market Growth Rate (CAGR 2025 to 2032): 14.0%

VoIP Services Market - Report Scope:

The VoIP Services Market encompasses a variety of communication services delivered over the internet, enabling voice, video, and messaging solutions. These services are designed to offer cost efficiency, flexibility, and enhanced communication quality, catering to a broad range of consumers, including enterprises, small businesses, and individual users. The market serves diverse segments, including hosted VoIP, managed VoIP, and residential VoIP services. Growth is driven by increasing adoption of cloud-based solutions, advancements in internet connectivity, and the expanding application of VoIP across various industries, including IT, healthcare, and retail.

Market Growth Drivers:

Several key factors are driving the global VoIP Services Market. The rising demand for cost-effective communication solutions among businesses and individuals boosts the market's growth. Technological advancements in internet infrastructure, such as the rollout of 5G networks, have improved the quality and reliability of VoIP services, further fueling market expansion. Additionally, the growing need for unified communication systems and remote work environments accelerates the adoption of VoIP services. Enhanced research and development activities, along with the introduction of innovative features such as AI-driven analytics and integration with collaboration tools, contribute to market growth by offering tailored solutions for different user segments.

Market Restraints:

Despite promising growth prospects, the VoIP Services Market faces challenges related to security concerns and regulatory complexities. Cybersecurity threats, such as data breaches and VoIP fraud, can deter potential users and hinder market expansion. Additionally, the availability of alternative communication solutions, such as traditional telephony and OTT (over-the-top) platforms, presents competition to VoIP services. Concerns about call quality in regions with inadequate internet infrastructure pose additional challenges. Addressing these issues requires ongoing investment in advanced security protocols, regulatory compliance, and the improvement of internet connectivity in underserved regions.

Market Opportunities:

The market presents significant opportunities driven by the increasing adoption of mobile VoIP services and the integration of advanced technologies, such as AI and blockchain, into communication platforms. The development of robust hybrid communication solutions catering to the needs of both on-site and remote workforces aligns with emerging consumer preferences. The expansion of VoIP services in emerging markets, supported by the growing penetration of smartphones and internet access, offers substantial growth potential. Strategic partnerships, investments in innovative technologies, and the introduction of customizable communication packages are essential for capitalizing on these opportunities and maintaining market leadership.

Key Questions Answered in the Report:

What are the primary factors driving the growth of the VoIP Services Market globally?
Which types and applications of VoIP services are leading the adoption in various industries?
How are technological advancements influencing the competitive landscape of the VoIP Services Market?
Who are the key players in the VoIP Services Market, and what strategies are they employing to stay competitive?
What are the emerging trends and future prospects in the global VoIP Services Market?

Competitive Intelligence and Business Strategy:

Leading players in the global VoIP Services Market, including Vonage, RingCentral, and 8x8, focus on innovation, product differentiation, and strategic collaborations to gain a competitive edge. These companies invest in R&D to develop advanced VoIP solutions and explore new features such as enhanced security, analytics, and seamless integration with other software tools. Collaborations with telecom providers, cloud service companies, and IT vendors facilitate market access and promote adoption of VoIP services. Emphasis on user education, high-quality services, and comprehensive marketing strategies fosters market growth and enhances brand loyalty in the evolving VoIP Services Market landscape.

Key Companies Profiled:

Vonage Holdings Corporation
8x8 Inc.
ShoreTel Nextiva Inc.
RingCentral Inc.
West Corporation
Verizon Communications Inc.
Thinking Phone Networks Inc.
Inphonex LLC
Phone Power LLC
Grasshopper

Key Segments of VoIP Services Market Industry Research

By Call Type:

International VoIP Call
Domestic VoIP Call

By Configuration:

Computer-to-Computer VoIP
Computer-to-Phone VoIP
Phone-to-Phone VoIP

By Service:

SIP Trunking
Hosted IP PBX
Managed IP PBX
Others

By End User:

Individual User
Corporate User

Region:

North America
Latin America
Europe
East Asia
South Asia Pacific
Middle East and Africa

1. Executive Summary

1.1. Global Market Outlook
1.2. Demand Side Trends
1.3. Supply Side Trends
1.4. Analysis and Recommendations

2. Market Overview

2.1. Market Coverage / Taxonomy
2.2. Market Definition / Scope / Limitations

3. Key Market Trends

3.1. Key Trends Impacting the Market
3.2. VoIP Technology Innovation / Development Trends

4. Pricing Analysis

4.1. Pricing Analysis, By VoIP Services
4.2. Average Pricing Analysis Benchmark

5. Global VoIP Services Market Demand (Value in US$ Mn) Analysis 2020 - 2024 and Forecast, 2025 - 2032

5.1. Historical Market Value (US$ Mn) Analysis, 2020 - 2024
5.2. Current and Future Market Value (US$ Mn) Projections, 2025 - 2032
- 5.2.1. Y-o-Y Growth Trend Analysis
- 5.2.2. Absolute $ Opportunity Analysis

6. Market Background

6.1. Macro-Economic Factors
6.2. Forecast Factors - Relevance & Impact
6.3. Value Chain
6.4. COVID-19 Crisis - Impact Assessment
- 6.4.1. Current Statistics
- 6.4.2. Short-Mid-Long Term Outlook
- 6.4.3. Likely Rebound
6.5. Market Dynamics
- 6.5.1. Drivers
- 6.5.2. Restraints
- 6.5.3. Opportunities

7. Global VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032, By Call Type

7.1. Introduction / Key Findings
7.2. Historical Market Size (US$ Mn) Analysis By Call Type, 2020 - 2024
7.3. Current and Future Market Size (US$ Mn) Analysis and Forecast By Call Type, 2025 - 2032
- 7.3.1. International VoIP Call
- 7.3.2. Domestic VoIP Call
7.4. Market Attractiveness Analysis By Call Type

8. Global VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032, by Configuration

8.1. Introduction / Key Findings
8.2. Historical Market Size (US$ Mn) Analysis By Configuration, 2020 - 2024
8.3. Current and Future Market Size (US$ Mn) Analysis and Forecast By Configuration, 2025 - 2032
- 8.3.1. Computer-to-Computer VoIP
- 8.3.2. Computer-to-Phone VoIP
- 8.3.3. Phone-to-Phone VoIP
8.4. Market Attractiveness Analysis By Configuration

9. Global VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032, By Service

9.1. Introduction / Key Findings
9.2. Historical Market Size (US$ Mn) Analysis By Service, 2020 - 2024
9.3. Current and Future Market Size (US$ Mn) Analysis and Forecast By Service, 2025 - 2032
- 9.3.1. SIP Trunking
- 9.3.2. Hosted IP PBX
- 9.3.3. Managed IP PBX
- 9.3.4. Others
9.4. Market Attractiveness Analysis By Service

10. Global VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032, By End User

10.1. Introduction / Key Findings
10.2. Historical Market Size (US$ Mn) Analysis By End User, 2020 - 2024
10.3. Current and Future Market Size (US$ Mn) Analysis and Forecast By End User, 2025 - 2032
- 10.3.1. Individual User
- 10.3.2. Corporate User
10.4. Market Attractiveness Analysis By End User

11. Global VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032, by Region

11.1. Introduction / Key Findings
11.2. Historical Market Size (US$ Mn) Analysis By Region, 2020 - 2024
11.3. Current and Future Market Size (US$ Mn) Analysis and Forecast By Region, 2025 - 2032
- 11.3.1. North America
- 11.3.2. Latin America
- 11.3.3. Europe
- 11.3.4. East Asia
- 11.3.5. South Asia Pacific
- 11.3.6. Middle East and Africa
11.4. Market Attractiveness Analysis By Region

12. North America VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032

12.1. Introduction
12.2. Historical Market Size (US$ Mn) Trend Analysis By Market Taxonomy, 2020 - 2024
12.3. Current and Future Market Size (US$ Mn) Forecast By Market Taxonomy, 2025 - 2032
- 12.3.1. By Call Type
- 12.3.2. By Configuration
- 12.3.3. By Service
- 12.3.4. By End User
- 12.3.5. By Country
  - 12.3.5.1. U.S.
  - 12.3.5.2. Canada
12.4. Market Attractiveness Analysis
- 12.4.1. By Call Type
- 12.4.2. By Configuration
- 12.4.3. By Service
- 12.4.4. By End User
- 12.4.5. By Country
12.5. Market Trends
12.6. Key Market Participants - Intensity Mapping

13. Latin America VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032

13.1. Introduction
13.2. Historical Market Size (US$ Mn) Trend Analysis By Market Taxonomy, 2020 - 2024
13.3. Current and Future Market Size (US$ Mn) Forecast By Market Taxonomy, 2025 - 2032
- 13.3.1. By Call Type
- 13.3.2. By Configuration
- 13.3.3. By Service
- 13.3.4. By End User
- 13.3.5. By Country
  - 13.3.5.1. Brazil
  - 13.3.5.2. Mexico
  - 13.3.5.3. Rest of Latin America
13.4. Market Attractiveness Analysis
- 13.4.1. By Call Type
- 13.4.2. By Configuration
- 13.4.3. By Service
- 13.4.4. By End User
- 13.4.5. By Country

14. Europe VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032

14.1. Introduction
14.2. Historical Market Size (US$ Mn) Trend Analysis By Market Taxonomy, 2020 - 2024
14.3. Current and Future Market Size (US$ Mn) Forecast By Market Taxonomy, 2025 - 2032
- 14.3.1. By Call Type
- 14.3.2. By Configuration
- 14.3.3. By Service
- 14.3.4. By End User
- 14.3.5. By Country
  - 14.3.5.1. Germany
  - 14.3.5.2. Italy
  - 14.3.5.3. France
  - 14.3.5.4. U.K.
  - 14.3.5.5. Spain
  - 14.3.5.6. BENELUX
  - 14.3.5.7. Russia
  - 14.3.5.8. Rest of Europe
14.4. Market Attractiveness Analysis
- 14.4.1. By Call Type
- 14.4.2. By Configuration
- 14.4.3. By Service
- 14.4.4. By End User
- 14.4.5. By Country

15. South Asia & Pacific VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032

15.1. Introduction
15.2. Historical Market Size (US$ Mn) Trend Analysis By Market Taxonomy, 2020 - 2024
15.3. Current and Future Market Size (US$ Mn) Forecast By Market Taxonomy, 2025 - 2032
- 15.3.1. By Call Type
- 15.3.2. By Configuration
- 15.3.3. By Service
- 15.3.4. By End User
- 15.3.5. By Country
  - 15.3.5.1. India
  - 15.3.5.2. Indonesia
  - 15.3.5.3. Malaysia
  - 15.3.5.4. Singapore
  - 15.3.5.5. Australia & New Zealand
  - 15.3.5.6. Rest of South Asia and Pacific
15.4. Market Attractiveness Analysis
- 15.4.1. By Call Type
- 15.4.2. By Configuration
- 15.4.3. By Service
- 15.4.4. By End User
- 15.4.5. By Country

16. East Asia VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032

16.1. Introduction
16.2. Historical Market Size (US$ Mn) Trend Analysis By Market Taxonomy, 2020 - 2024
16.3. Current and Future Market Size (US$ Mn) Forecast By Market Taxonomy, 2025 - 2032
- 16.3.1. By Call Type
- 16.3.2. By Configuration
- 16.3.3. By Service
- 16.3.4. By End User
- 16.3.5. By Country
  - 16.3.5.1. China
  - 16.3.5.2. Japan
  - 16.3.5.3. South Korea
16.4. Market Attractiveness Analysis
- 16.4.1. By Call Type
- 16.4.2. By Configuration
- 16.4.3. By Service
- 16.4.4. By End User
- 16.4.5. By Country

17. Middle East and Africa VoIP Services Market Analysis 2020 - 2024 and Forecast 2025 - 2032

17.1. Introduction
17.2. Historical Market Size (US$ Mn) Trend Analysis By Market Taxonomy, 2020 - 2024
17.3. Current and Future Market Size (US$ Mn) Forecast By Market Taxonomy, 2025 - 2032
- 17.3.1. By Call Type
- 17.3.2. By Configuration
- 17.3.3. By Service
- 17.3.4. By End User
- 17.3.5. By Country
  - 17.3.5.1. GCC Countries
  - 17.3.5.2. Turkey
  - 17.3.5.3. South Africa
  - 17.3.5.4. Rest of Middle East and Africa
17.4. Market Attractiveness Analysis
- 17.4.1. By Call Type
- 17.4.2. By Configuration
- 17.4.3. By Service
- 17.4.4. By End User
- 17.4.5. By Country

18. Key Countries Analysis- VoIP Services Market

18.1. U.S. VoIP Services Market Analysis
- 18.1.1. By Call Type
- 18.1.2. By Configuration
- 18.1.3. By Service
- 18.1.4. By End User
18.2. Canada VoIP Services Market Analysis
- 18.2.1. By Call Type
- 18.2.2. By Configuration
- 18.2.3. By Service
- 18.2.4. By End User
18.3. Germany VoIP Services Market Analysis
- 18.3.1. By Call Type
- 18.3.2. By Configuration
- 18.3.3. By Service
- 18.3.4. By End User
18.4. U.K. VoIP Services Market Analysis
- 18.4.1. By Call Type
- 18.4.2. By Configuration
- 18.4.3. By Service
- 18.4.4. By End User
18.5. France VoIP Services Market Analysis
- 18.5.1. By Call Type
- 18.5.2. By Configuration
- 18.5.3. By Service
- 18.5.4. By End User
18.6. Italy VoIP Services Market Analysis
- 18.6.1. By Call Type
- 18.6.2. By Configuration
- 18.6.3. By Service
- 18.6.4. By End User
18.7. Spain VoIP Services Market Analysis
- 18.7.1. By Call Type
- 18.7.2. By Configuration
- 18.7.3. By Service
- 18.7.4. By End User
18.8. Russia VoIP Services Market Analysis
- 18.8.1. By Call Type
- 18.8.2. By Configuration
- 18.8.3. By Service
- 18.8.4. By End User
18.9. China VoIP Services Market Analysis
- 18.9.1. By Call Type
- 18.9.2. By Configuration
- 18.9.3. By Service
- 18.9.4. By End User
18.10. Japan VoIP Services Market Analysis
- 18.10.1. By Call Type
- 18.10.2. By Configuration
- 18.10.3. By Service
- 18.10.4. By End User
18.11. South Korea VoIP Services Market Analysis
- 18.11.1. By Call Type
- 18.11.2. By Configuration
- 18.11.3. By Service
- 18.11.4. By End User
18.12. India VoIP Services Market Analysis
- 18.12.1. By Call Type
- 18.12.2. By Configuration
- 18.12.3. By Service
- 18.12.4. By End User
18.13. Indonesia VoIP Services Market Analysis
- 18.13.1. By Call Type
- 18.13.2. By Configuration
- 18.13.3. By Service
- 18.13.4. By End User
18.14. Malaysia VoIP Services Market Analysis
- 18.14.1. By Call Type
- 18.14.2. By Configuration
- 18.14.3. By Service
- 18.14.4. By End User
18.15. Australia & New Zealand VoIP Services Market Analysis
- 18.15.1. By Call Type
- 18.15.2. By Configuration
- 18.15.3. By Service
- 18.15.4. By End User
18.16. GCC Countries VoIP Services Market Analysis
- 18.16.1. By Call Type
- 18.16.2. By Configuration
- 18.16.3. By Service
- 18.16.4. By End User
18.17. Turkey VoIP Services Market Analysis
- 18.17.1. By Call Type
- 18.17.2. By Configuration
- 18.17.3. By Service
- 18.17.4. By End User
18.18. Northern Africa VoIP Services Market Analysis
- 18.18.1. By Call Type
- 18.18.2. By Configuration
- 18.18.3. By Service
- 18.18.4. By End User
18.19. South Africa VoIP Services Market Analysis
- 18.19.1. By Call Type
- 18.19.2. By Configuration
- 18.19.3. By Service
- 18.19.4. By End User

19. Market Structure Analysis

19.1. Market Analysis by Tier of Companies
19.2. Market Share Analysis of Top Players
19.3. Market Presence Analysis

20. Competition Analysis

20.1. Competition Dashboard
20.2. Competition Benchmarking
20.3. Competition Deep Dive
- 20.3.1. Vonage Holdings Corporation
  - 20.3.1.1. Business Overview
  - 20.3.1.2. Solution Portfolio
  - 20.3.1.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.1.4. Key Strategy & Developments
- 20.3.2. 8x8 Inc.
  - 20.3.2.1. Business Overview
  - 20.3.2.2. Solution Portfolio
  - 20.3.2.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.2.4. Key Strategy & Developments
- 20.3.3. ShoreTel Nextiva Inc.
  - 20.3.3.1. Business Overview
  - 20.3.3.2. Solution Portfolio
  - 20.3.3.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.3.4. Key Strategy & Developments
- 20.3.4. RingCentral Inc.
  - 20.3.4.1. Business Overview
  - 20.3.4.2. Solution Portfolio
  - 20.3.4.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.4.4. Key Strategy & Developments
- 20.3.5. West Corporation
  - 20.3.5.1. Business Overview
  - 20.3.5.2. Solution Portfolio
  - 20.3.5.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.5.4. Key Strategy & Developments
- 20.3.6. Verizon Communications Inc.
  - 20.3.6.1. Business Overview
  - 20.3.6.2. Solution Portfolio
  - 20.3.6.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.6.4. Key Strategy & Developments
- 20.3.7. Thinking Phone Networks Inc.
  - 20.3.7.1. Business Overview
  - 20.3.7.2. Solution Portfolio
  - 20.3.7.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.7.4. Key Strategy & Developments
- 20.3.8. Inphonex LLC
  - 20.3.8.1. Business Overview
  - 20.3.8.2. Solution Portfolio
  - 20.3.8.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.8.4. Key Strategy & Developments
- 20.3.9. Phone Power LLC
  - 20.3.9.1. Business Overview
  - 20.3.9.2. Solution Portfolio
  - 20.3.9.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.9.4. Key Strategy & Developments
- 20.3.10. Grasshopper
  - 20.3.10.1. Business Overview
  - 20.3.10.2. Solution Portfolio
  - 20.3.10.3. Profitability by Market Segments (Business Segments/Region)
  - 20.3.10.4. Key Strategy & Developments

한글목차

목차

제1장 주요 요약

제2장 시장 개요

제3장 주요 시장 동향

제4장 가격 분석

제5장 세계의 VoIP 서비스 수요 분석·예측

제6장 시장 배경

제7장 세계의 VoIP 서비스 시장 분석과 예측 : 통화 유형별

제8장 세계의 VoIP 서비스 시장 분석과 예측 : 구성별

제9장 세계의 VoIP 서비스 시장 분석과 예측 : 서비스별

제10장 세계의 VoIP 서비스 시장 분석과 예측 : 최종사용자별

제11장 세계의 VoIP 서비스 시장 분석과 예측 : 지역별

제12장 북미 VoIP 서비스 시장 분석·예측

제13장 라틴아메리카 VoIP 서비스 시장 분석·예측

제14장 유럽 VoIP 서비스 시장 분석·예측

제15장 남아시아·태평양의 VoIP 서비스 시장 분석·예측

제16장 동아시아의 VoIP 서비스 시장 분석·예측

제17장 중동 및 아프리카의 VoIP 서비스 시장 분석·예측

제18장 주요 국가 분석 : VoIP 서비스 시장

제19장 시장 구조 분석

제20장 경쟁 분석

제21장 가정과 두자어

제22장 조사 방법