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Peace of mind when porting
toll-free to us

Redundant service for your mission-critical installs.

Before you port-in your numbers to DID Logic, our Provisioning team works directly with your IT and Engineering teams to create a highly available, completely reliable SIP setup. You can rest easy knowing that your inbound DID trunk is just as reliable as the traditional telephone service.

Interconnection options

  • Public IP. We eliminate as much Internet travel as possible. Unlike most VoIP providers, DID Logic actually takes some responsibility for the routing between your ISP and our gateways. We buy our own IP transit. Your ISP is likely buying from at least one Tier1 that we also buy from. As a result, traffic never leaves their Autonomous System (AS) and bypasses most of the public Internet.
  • Over the free SwitchPorts service (at participating data centers). If you host your VoIP appliance in the same facility (and your colocation provider is part of our SwitchPorts community) your connection is automatically established over gigabit Cisco switching fabric with zero hops in between.
  • Direct fiber cross-connect on-site. Available at London Telehouse North, Telecity AMS04-DLR and 1 Wilshire Coresite LA1. Data center will provide dedicated rack to rack connection using the local cabling infrastructure. Single or dual 1G or 10G connections are available.

Three delivery options available

1. Directly to your static IP address via SIP URI. For example, 12125551212@ The instant the number ports, your PBX answers the calls just like it did on the loosing carrier (as long as you have inbound rules created). When configured correctly, this setup is practically indestructible.

SIP INVITE example:     SIP.LAX    2016/06/12
INVITE sip:12125551212@ SIP/2.0
From: "James M." sip:+17036971776@;tag=as3bf610bb
Contact: sip:+17036971776@
Call-ID: 7ee2e1d674d4f29157b93bbe0c27302ac
CSeq: 102 INVITE
Content-Type: application/sdp

Many customers with 24/7 ops (finance, medical or travel) use two independent systems with DNS SRV. This feature allows you to use two separate redundant PBX systems and instantly reroute voice traffic. DNS SRV entries can return several IPs, by order of priority, on a specific port. For example, SIP 5060 can have DNS SRV entries of: and, two independent systems at different IPs. If you point your DID to a DNS SRV based hostname, our system will instantly detect failure on primary IP and will replace that entry with 2nd entry from your DNS SRV.

You can have more than 2 entries of course and more than 2 IPs associated with the hostname. Failure detection is nearly instant and our proxy will keep distributing calls to IPs that are live and respond. You only need to point to 1 hostname on our end. By managing DNS SRV on your end, you can have health checks and call distribution required.

2. To your SIP endpoint actively registered to DID Logic. Any IP PBX capable of SIP registration can be used to route your DID number. The SIP REGISTER method can be used on 3CX, FreeSwitch, Asterisk and many other office PBXes.

Registration string example:


3. Forwarded to PSTN. You can forward your DIDs to domestic or international phone numbers. This option can be used for backup, DR, and mobility purposes.

Redundancy built in

There is no single point of failure in our telco core. Every single element of the network is protected on every level: physical, link layer, routing, and application.

Redundant gateways

We use memory-synced, carrier-grade SBCs that exist on multiple physical chassis simultaneously. On top of the logical SBC redundancy, we run the same PoP in two physically separated locations. For example, in the UK, we rely on London Telehouse North and BT Cardiff. Both facilities contain four sets of identical gear and can operate independently or in tandem.

Redundant IP-side

We buy from multiple Tier1 IP transit providers in each location. Our team of Cisco-certified engineers builds, operates and supervises redundant switch clusters connected to several IP providers, such as TeliaSonera, NTT or GTT. Presence of multiple Tier1 carriers in route protects the IP leg of the VoIP service from network outages.

Redundant telephone
carrier-side connections

Our equipment sits right next to the underlying carrier suites in the same carrier hotels they use. We use a minimum of two fiber strands per each partner cross connect to completely rule out incidents of physical link disruption.

Redundant data centers

In most of our locations, the facility that hosts our PoPs offers 100% uptime SLA and six nines (99.9999%) uptime track record. We only use Tier III and Tier IV data centers that host critical segments of the global telecommunication infrastructure.

Free trial is available for IT infrastructure managers and developers.