Carrier Interconnection
Bilateral voice interconnects over SIP, TDM or private IPX-style links at six global PoPs - with swap and bilateral commercial models built for carriers, MNOs and MVNOs.
600+
Carrier interconnects
6
Core interconnect PoPs
1.4 Tbps
Backbone capacity
What is Carrier Interconnection?
Carrier Interconnection is Dollu's programme for licensed operators who want a direct relationship rather than a customer account. We interconnect bilaterally with international carriers, mobile network operators, MVNOs, fixed-line incumbents and OTT platforms so that traffic in both directions travels over a single, engineered handoff - with the routing, quality measurement and settlement that a peer relationship deserves.
Interconnects are established at our core PoPs in London, Frankfurt, Amsterdam, Ashburn, Mumbai and Singapore, and at additional partner facilities across our 40+ point footprint. Handoff can be SIP over the public internet, SIP over IPsec or MPLS, a physical cross-connect within the same building, or TDM/SS7 through our media gateways where an operator's international gateway still speaks E1/T1. For MNOs and IPX participants we offer private, QoS-marked interconnect that keeps signalling and media off the public internet end to end.
Commercially, we work the way carriers do. Bilateral agreements set inbound and outbound rate decks with agreed billing increments, dispute windows and settlement cycles. Swap arrangements match volumes on complementary destinations to reduce cash settlement. Sending-party-pays, revenue-share and hubbing models are all available, and our carrier-relations team handles the reconciliation, dispute and invoicing cycle with the discipline your finance team expects.
Every interconnect is monitored as a route in our platform: ASR, ACD, PDD, MOS and CLI-delivery statistics are visible to both sides, and traffic can be steered or capped per prefix without a support ticket. Operators typically start with a single SIP interconnect for a handful of destinations and grow into multi-PoP, multi-service relationships that add origination, SMS interworking and signalling services on the same paperwork.
Wholesale routing: how a call finds its route.
Why choose Dollu for carrier interconnect.
The advantages of buying from a carrier that owns its network, interconnects and operations - rather than a reseller.
Direct routes in both directions
Bilateral interconnect removes intermediaries from your traffic and ours, improving CLI delivery, PDD and margin on the destinations each side brings.
Reach through one relationship
Interconnect once and gain access to Dollu's A–Z portfolio, numbers in 110+ countries and messaging reach into 800+ operator connections.
Carrier-grade engineering
Dual-homed handoff, geo-redundant SBCs and 1.4 Tbps of backbone mean the interconnect is engineered for volume and outages, not just for a test call.
Commercial flexibility
Bilateral decks, swaps to offset settlement, hubbing for your smaller destinations and revenue-share on inbound, structured to fit how your finance team already works.
Transparent quality on both sides
Shared route KPIs and CDR reconciliation reduce disputes and let both teams manage routing on data rather than on complaints.
Capabilities in detail.
Everything included with Carrier Interconnection - the platform features, options and controls you get from day one.
- 01
SIP interconnect
SIP over UDP/TCP/TLS with RTP or SRTP; SIP-I/SIP-T interworking for operators bridging to SS7; codec negotiation and transcoding where operator policies differ.
- 02
TDM and SS7 handoff
E1/T1 with ISUP signalling via Dollu media gateways at select PoPs for international gateways not yet migrated to IP, with SIP-to-ISUP interworking managed by us.
- 03
Private IP and IPX-style interconnect
IPsec, MPLS or dedicated cross-connect with QoS marking, dual-homed routing and no public internet in path; suited to MNOs, IPX participants and regulated traffic.
- 04
PoP cross-connects
Physical interconnect at London, Frankfurt, Amsterdam, Ashburn, Mumbai and Singapore, plus partner-facility handoff across a 40+ PoP footprint; 1G and 10G ports.
- 05
Bilateral and swap agreements
Two-way rate decks with agreed increments, dispute windows and settlement cycles; volume swaps on complementary destinations to reduce cash settlement.
- 06
Hubbing and revenue share
Route your minor destinations through Dollu's portfolio under one deck; revenue-share on inbound to your numbers; sending-party-pays where the market uses it.
- 07
Shared quality and reporting
Per-route ASR, ACD, PDD, MOS and CLI-delivery statistics visible to both parties; CDR exchange for reconciliation; monthly QoS review with carrier-relations.
- 08
Capacity and traffic engineering
Committed and burst capacity per interconnect, per-prefix CPS and channel caps, and coordinated planning for seasonal or event peaks.
- 09
Multi-service extension
Add origination, DID hosting, A2P SMS interworking, signalling and roaming services on the same interconnect and agreement framework.
How it works.
From first conversation to live traffic - a tracked, engineer-led onboarding with a named owner at every step.
- Step 01
Qualify
Exchange licences, route lists and volume expectations. Carrier-relations proposes destinations, commercial model and the interconnect type that fits.
- Step 02
Agree
Sign the interconnect agreement and exchange rate decks, technical parameters and escalation contacts. Swaps and settlement terms are set here.
- Step 03
Build
Provision SIP, TDM or private handoff at the chosen PoP; complete IP, codec and CLI interoperability testing; agree capacity and failover.
- Step 04
Exchange traffic
Traffic flows both ways with shared KPIs. Both teams tune routing per prefix, and settlement, disputes and reconciliation run on the agreed cycle.
- Step 05
Grow
Add destinations, PoPs and services as volume grows. Quarterly reviews cover route performance, pricing and new bilateral opportunities.
Premium, Standard or Wholesale.
Every destination on the Dollu rate deck is offered in up to three quality tiers. Pick per destination - or per customer - and mix them on one interconnect.
| Dimension | Premium (CLI-guaranteed) | Standard | Wholesale |
|---|---|---|---|
| CLI delivery | Guaranteed - the originating number is delivered intact to the called party | Best effort - CLI is normally delivered but not contractually guaranteed | Not guaranteed - CLI may be withheld or replaced on some routes |
| Route type | Direct operator interconnects and Tier-1 partners only | Direct and vetted partner routes, quality-steered in real time | Least-cost blended routes, swapped freely to hold the price |
| Typical ASR band | Highest | High | Variable |
| PDD | Lowest | Low | Variable - can rise on multi-hop transit |
| Best for | Contact centres, retail and enterprise traffic, OTP voice calls - anywhere the called party must see who is calling | Business traffic where quality matters and CLI is helpful but not mandatory | High-volume carrier, dialler and call-centre traffic where price per minute dominates |
| SLA | Per-destination ASR, ACD and PDD targets with service credits | Quality targets monitored and reported; credits on core availability | Core availability only; route quality is managed, not guaranteed |
| Price position | Highest | Mid | Lowest |
All three tiers ride the same SIP interconnect, portal and CDRs - the tier is chosen per destination prefix, so you can move traffic between them without a new set-up.
Who uses this and why.
Typical deployments across carriers, enterprises, platforms and contact centres.
International carriers
Direct bilateral routes into South Asia, the Middle East and Africa in exchange for your home-market termination, with swap terms to balance settlement.
Mobile network operators
Private, QoS-marked interconnect for international voice, plus origination and messaging interworking to your subscribers under one framework.
MVNOs and MVNEs
Wholesale international voice, ILD calling plans and A2P interworking behind your brand without negotiating dozens of carrier agreements.
Fixed-line and cable operators
Replace legacy TDM international gateways with SIP interconnect to Dollu while keeping SS7 handoff for domestic legs until migration completes.
OTT and cloud communications platforms
Carrier-style interconnect for PSTN breakout and inbound numbers at scale, with per-prefix control and settlement-grade CDRs.
Technical & commercial specifications.
Key parameters at a glance. Ask us for the full service description and SLA document.
| Handoff | SIP (UDP/TCP/TLS), SIP-I/SIP-T, TDM E1/T1 with ISUP via gateway |
|---|---|
| Transport | Public IP, IPsec, MPLS, IPX-style private IP, PoP cross-connect |
| PoPs | London, Frankfurt, Amsterdam, Ashburn, Mumbai, Singapore; 40+ partner points |
| Ports | 1G and 10G Ethernet cross-connects; E1/T1 at TDM-enabled PoPs |
| Media | RTP/SRTP; G.711a/u, G.729, G.722, AMR-WB, Opus; transcoding |
| Commercial | Bilateral decks, swaps, hubbing, revenue share, sending-party-pays |
| Settlement | Monthly by default; agreed dispute window; CDR reconciliation |
| Quality | Shared ASR/ACD/PDD/MOS/CLI statistics per route; monthly QoS review |
| Capacity | Committed and burst; dual-homed handoff; per-prefix CPS and channels |
| Contact | [email protected]; carrier-relations manager; 24×7 NOC |
How Voice & Wholesale is priced.
Wholesale voice is priced from an A–Z rate deck: a rate per destination and breakout for each quality tier, billed on connected seconds. There are no setup or port fees on SIP interconnects.
We publish the model, not a public rate card - actual rates depend on destination, route class, volume and regulatory cost. See how every Dollu service is priced.
- A–Z rate deck in USD, EUR, GBP or INR
- Premium (CLI), Standard and Wholesale tiers per destination
- 1/1 billing on most destinations; 60/60 flagged on the deck
- Volume tiers from 1M minutes a month; bilateral and swap for carriers
- Rate increases with at least 7 days’ notice; decreases immediate
- Billing
- Prepaid (online top-up, auto-recharge) or postpaid net-15/30 after credit review; per-second increments
- Commitment
- None - month-to-month usage; optional volume commitments unlock better tiers
230+ destinations, A–Z.
Every country on the rate deck, in Premium, Standard and Wholesale tiers where the market supports them - over 600 direct carrier interconnects and Tier-1 partners. Country guides cover the destinations with the most traffic.
Carrier Interconnect - your questions answered.
The questions customers and carriers ask us most often before they interconnect. If yours is not here, our team answers within one business day.
Still have a question?
Ask our solutions teamRelated services.
Services customers commonly combine with Carrier Interconnection.
Talk to carrier relations.
Send your route list, volumes and preferred handoff to [email protected] and we will propose destinations, commercial terms and a build plan.
