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NTT Communications

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NTT Ltd.

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SIP Trunking

Arcstar SIP Trunking

Voice data convergence

Combine data and voice in a single line, eliminating the need for separate physical media for each service. 

Immediate cost reduction

Lower price structure for VoIP calls and channel aggregation from multiple sites reduces overall cost.

Enhanced functionality

Benefit from our state-of-the-art, high availability (HA) architecture for your business continuity planning (BCP).

Features and Benefits

PSTN Features
Reduce Costs

VoIP phone calls benefit from our Arcstar Universal One VPN connection to public switched telephone networks (PSTNs) around the world. Incoming calls from your customers and partners go directly to your Direct Inward Dialing (DID) numbers.


Arcstar SIP Trunking on-premise CPE model: Manage your own telephony infrastructure.

Arcstar SIP Trunking works with your PBX and a voice gateway or your IP-PBX. Bundle SIP Trunking with our Arcstar Unified Communications-as-a-Service (UCaaS) solution to further simplify global external communications with the cloud. 


Arcstar SIP Trunking hosted IP-PBX (UCaaS) model: Outsource your IP telephony and Unified Communications (UC) infrastructure.

Global carrier benefits:

  • SIP connectivity over our world-class Arcstar Universal One network gives you increased reliability, lower latency and better security than VoIP over Internet
  • Choose our Global Management One™ team to manage your VoIP infrastructure for a one-stop, global, seamless managed service.

SIP Trunking covers a wide range of services traditionally offered by PSTN, so you can gradually reduce your reliance on PSTN.

  • Outbound
  • Inbound
  • Number portability
  • Emergency calls
  • Toll free

Don’t get locked into excessive analog lines or partially used T1s and PRIs. Pool SIP Trunking capacity across your entire organization and only pay for concurrent sessions used.

Arcstar SIP Trunking offers highly competitive calling charges and supports emergency calling and number portability. Our web-based customer portal enables you to check and download detailed call data for effective cost management.

Cost Simulation (in USD)

Example 1

Simulation Assumptions:

  • Number of calls per hour: 26
  • Average call time: 5 minutes
  • Business days per month: 20
  • Call source: Singapore
  • Call destination: India, Malaysia, China, Indonesia, Thailand

Overseas carrier international calling service: $8,500 per month

Arcstar SIP Trunking: $2,600 per month

70% Cost Reduction

Example 2

Simulation Assumptions:

  • Number of calls per hour: 610
  • Average call time: 5 minutes
  • Business days per month: 20
  • Call source: USA
  • Call destination: Australia, Mexico, Canada, UK, China, Japan, Germany, France, Philippines

International call service of USA carrier: $10,065 per month

Arcstar SIP Trunking: $3,514 per month

65% Cost Reduction


Combine our Arcstar Unified Communications-as-a-Service (UCaaS) and Arcstar SIP Trunking services for a comprehensive communication and collaboration platform in the cloud.

Together, these two services support internal and external voice communications and bring new collaboration capabilities such as audio, video, web conferencing, instant messaging and presence features.


Related Resources

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