Advantages of merging SIP calls onto your VPN

  • SIP trunking using an MPLS VPN can make your network faster, more secure, and easier to manage.

  • An MPLS VPN can support integration of chat, conferencing, and other IP-based services with your VoIP service.

Session Initiation Protocol (SIP) trunks let you send voice over IP (VoIP) calls across an IP WAN. Virtual channels are faster and often more cost-efficient for Internal call plans.

You can create a VoIP VPN for voice calls using your enterprise-class MPLS VPN service or the Internet. If you use the Internet, you can encrypt digitized voice streams in standard IPsec in your WAN edge router. At the other end, another VoIP router decodes the voice and converts the digital voice to an analog signal for delivery to the phone.

Here are some advantages for using an MPLS VPN instead of the Internet for your SIP traffic:

  • MPLS VPN is more reliable than the Internet for several reasons, including network-based security. IPsec isn’t recommended for VoIP calls running on lower-bandwidth mobile networks. You’ll likely be hard-pressed to find a VoIP service level agreement (SLA) for Internet calling, though you will find them for MPLS-based VoIP VPN services.
  • You can run SIP traffic across a VPN to avoid firewall issues.
  • SIP trunks also can carry other IP-centric communications, such as chat, conferencing, presence data, and E911 calls. Routing those time-sensitive communications over a service where quality of service (QoS) and traffic engineering are in play helps manage resource availability, and MPLS meets that need.

Services running on IP are designed to work together. Combining your SIP and VPN can help make your network more efficient and reduce the added costs of maintaining separate voice and data networks.

Learn more about how SIP can work with VPN at AT&T VPN Services.

Sybil Fitzpatrick Lead Product Marketing Communications AT&T About Sybil