Signalling Services (SS7, Diameter, HTTP/2)
Carrier-grade SS7, Diameter and 5G HTTP/2 signalling transport, hubbing and interworking - with STP, DRA and SEPP functions, a signalling firewall and number lookup services on a global GRX/IPX footprint.
3
Generations: SS7, Diameter, HTTP/2
600+
Signalling partner networks
99.99%
Signalling core availability
What is Signalling Services (SS7, Diameter, HTTP/2)?
Signalling is the nervous system of mobile networks: it authenticates subscribers, locates them, sets up calls and sessions and moves them between networks. Dollu operates a global signalling platform spanning three generations of protocol - SS7 (MAP, CAMEL, ISUP) over TDM and SIGTRAN, Diameter for LTE and IMS, and HTTP/2-based 5G service-based interfaces - so operators, MVNOs, IoT providers and messaging companies can connect once and reach partner networks worldwide without building their own signalling relationships one peer at a time.
The platform is built around carrier-grade network functions: geo-redundant Signalling Transfer Points, Diameter Routing Agents and Security Edge Protection Proxies deployed across our PoPs in London, Frankfurt, Amsterdam, Ashburn, Mumbai and Singapore. These functions provide transport, hubbing and interworking - translating between SS7 and Diameter for LTE-to-legacy roaming, between Diameter and HTTP/2 for 5G-to-4G interworking, and normalising vendor-specific behaviour so that your core sees a clean, consistent peer regardless of what sits on the other side.
Security is not an add-on. Every signalling link passes through our signalling firewall, which screens SS7 Category 1–3 messages, Diameter and 5G traffic against GSMA FS.11, FS.19, FS.20 and FS.36 recommendations, blocking location tracking, interception, SMS spoofing and denial-of-service attempts while allowing legitimate roaming and interconnect signalling to flow. Threat feeds are updated continuously and every blocked event is logged and available to your security team through the portal and API.
On top of transport we offer lookup services that turn signalling into business data: number portability lookups for accurate routing and billing, HLR/HSS lookups returning live subscriber status, IMSI and serving network for anti-fraud and messaging optimisation, and MNP database access in 100+ countries. All are available over the same signalling links, or as simple HTTPS APIs for customers who only need the answers rather than the protocols.
Why choose Dollu for signalling services.
The advantages of buying from a carrier that owns its network, interconnects and operations - rather than a reseller.
One connection, every peer
Connect a single SIGTRAN or Diameter link and reach hundreds of partner networks; we manage the point codes, GT ranges, realms and peer relationships on your behalf.
Protect subscribers and revenue
A signalling firewall in the path stops location tracking, SMS interception and fraud, and gives your security team evidence rather than surprises.
Bridge generations without a forklift
Interworking lets an LTE-only or 5G-first core roam onto legacy partners, and legacy cores serve 4G and 5G roamers, without adding vendors.
Route smarter with better data
MNP and HLR lookups let voice and messaging platforms route to the right operator first time, cutting failed calls and undelivered SMS.
Carrier availability and support
Geo-redundant functions, dual-homed links and a signalling NOC that watches every peer 24×7 with 15-minute P1 response.
Capabilities in detail.
Everything included with Signalling Services (SS7, Diameter, HTTP/2) - the platform features, options and controls you get from day one.
- 01
SS7 signalling transport and hubbing
International SCCP/GT routing, MAP and CAMEL relay, ISUP for TDM interconnects; TDM E1 or SIGTRAN M2PA/M3UA access; GT translation and screening; SMS hubbing capable.
- 02
Diameter routing agent
Realm-based routing for S6a/S6d, S9, Gx/Gy, Rx and SWx; topology hiding, load balancing and overload control; Diameter Edge Agent function for roaming and IPX peering.
- 03
5G security edge protection proxy
GSMA-compliant SEPP for N32-c and N32-f with TLS and PRINS, HTTP/2 routing to partner SEPPs, and interworking to Diameter for 5G subscribers on LTE partner networks.
- 04
Interworking functions
SS7-to-Diameter IWF for LTE roaming onto 2G/3G partners, Diameter-to-HTTP/2 for 5G-to-4G, MAP version negotiation and vendor normalisation.
- 05
Signalling firewall and security
Category 1, 2 and 3 SS7 filtering, Diameter and 5G message screening, velocity checks, SMS home routing, threat intelligence updates and reporting aligned to GSMA FS.11, FS.19, FS.20 and FS.36.
- 06
Number portability lookup
Real-time MNP queries against operator databases and portability registries in 100+ countries; batch and streaming APIs; caching with configurable TTL for high-volume routing.
- 07
HLR/HSS lookup
Live subscriber status, IMSI, serving MSC/MME and roaming indicator via MAP SRI-SM or Diameter; used for SMS optimisation, fraud checks and number validation.
- 08
GRX/IPX transport
Private, QoS-marked IP transport for GTP, Diameter and SIP-I traffic with dual-homed peering at our PoPs and 24×7 monitoring.
How it works.
From first conversation to live traffic - a tracked, engineer-led onboarding with a named owner at every step.
- Step 01
Design
We map your point codes, global titles, Diameter realms and 5G PLMN identifiers, agree the routing and security policies and produce an interconnect design.
- Step 02
Connect
Bring up SIGTRAN, Diameter or N32 links over IPX, cross-connect or IPsec at two of our PoPs for redundancy; complete link and route testing.
- Step 03
Migrate peers
Move partner relationships onto the Dollu platform in waves; we handle peer coordination and run parallel operation until you are confident.
- Step 04
Operate
Firewall policies, lookups and interworking run continuously with dashboards, alerts and monthly security reports; capacity grows as your traffic does.
Who uses this and why.
Typical deployments across carriers, enterprises, platforms and contact centres.
Mobile network operators
Outsource international signalling, add a firewall in front of legacy STPs and gain 5G roaming readiness without new vendors.
MVNOs and full MVNOs
Independent HLR/HSS and roaming signalling with a hub connection instead of dozens of bilateral links.
Messaging and voice providers
MNP and HLR lookups to route SMS and calls correctly, screen invalid numbers and reduce cost per delivered message.
IoT connectivity providers
Signalling reach for multi-IMSI and sponsored-roaming SIMs across every generation of partner network.
Security and fraud teams
Signalling firewall logs and lookup data feeding SIM-swap, SMS interception and location-tracking detection.
Technical & commercial specifications.
Key parameters at a glance. Ask us for the full service description and SLA document.
| Protocols | SS7 MAP/CAMEL/ISUP/SCCP; Diameter (RFC 6733); 5G HTTP/2 SBI |
|---|---|
| Access | TDM E1, SIGTRAN M2PA/M3UA over SCTP, Diameter over SCTP/TCP/TLS, N32 |
| Network functions | STP, DRA/DEA, SEPP, IWF, signalling firewall, SMS home router |
| Transport | GRX/IPX, PoP cross-connect, IPsec; dual-homed peering |
| PoPs | London, Frankfurt, Amsterdam, Ashburn, Mumbai, Singapore |
| Security | GSMA FS.11, FS.19, FS.20, FS.36 aligned; category 1–3 filtering |
| Lookups | MNP in 100+ countries; HLR/HSS; HTTPS API or native MAP/Diameter |
| Availability | Geo-redundant functions; 99.99% availability SLA |
| Support | 24×7 signalling NOC; P1 response ≤ 15 min; named engineer |
How Mobile & IoT is priced.
IoT connectivity is priced per active SIM per month with data pooled across the estate; roaming and signalling by usage; device management per device.
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.
- Per-SIM monthly fee with pooled data across the estate
- Roaming per MB, per minute or per SMS by zone
- Signalling per transaction or per link
- Device management per device per month
- Volume tiers by active SIM count
- Billing
- Monthly per active SIM plus metered usage; postpaid after credit review
- Commitment
- None on usage; committed SIM volumes earn discounts
Signalling Services - 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 Signalling Services (SS7, Diameter, HTTP/2).
Discuss your signalling architecture.
Send us your protocol mix, peer count and target markets and our signalling engineers will propose an interconnect design and firewall policy.
