# Global SIP trunking service

Connect your PBX, contact center, dialer, or AI voice agents to reliable voice in 140+ countries. Sub-20ms audio on 80% of calls, no per-channel fees, and a free test number to start. [See call rates](https://didlogic.com/pricing/wholesale-international-voice/call-rates/)

140+

countries with local & toll-free numbers

80%

of calls under 20ms added latency

12

physical PoPs on our own ASN (AS13006)

\$0

per-channel, per-trunk fees

## What you get with didlogic SIP trunking

### Global number coverage

Local and toll-free numbers in 140+ countries. Native caller ID on the same circuit as your inbound DIDs. Licensed local voice in 17 regulated markets.

### Low-latency voice

Sub-20ms audio on 80% of calls. 12 physical PoPs, our own Autonomous System (AS13006), and direct Tier 1 peering keep the voice path short and domestic.

### Portal and API provisioning

Create SIP trunks from the portal or over the REST API. Set credentials or IP authentication, allowlist IPs, and cap channels, call length, and call cost per trunk. No ticket required.

### SIP REFER for call transfer

Transfer live calls to another endpoint or human agent without dropping the session. Works for [AI agent](https://didlogic.com/ai-voice/) escalations and contact center transfers.

### CLI rotation for outbound

Manage a pool of caller IDs directly from your account. Rotate numbers to improve answer rates, reduce spam flagging, and push ASR up on outbound campaigns.

### Elastic capacity, no channel fees

No charge per channel. No charge per trunk. Raise concurrent channels and CPS on request, usually same-day. Capacity scales with your traffic, not your contract.

## Voice that stays on our network from start to finish

Most SIP providers are resellers. Your traffic crosses several hands, aggregates in one region, and arrives with latency you cannot control.

didlogic runs its own Autonomous System, AS13006, with owned hardware in 12 carrier-dense data centers across Europe, North America, APAC, Oceania, Africa, and South America. We buy IP transit directly from Tier 1 carriers (PCCW, GTT, Telia, NTT) and peer at major Internet Exchanges.

That is how we hold sub-20ms audio latency on 80% of calls. The remaining 20% are long-haul or cross-region paths where physics and carrier geography take over.

## Provision trunks from the portal, or the API

Create a SIP account in the portal in under a minute: name it, set a password, pick a caller ID from your DIDs. Or automate the whole thing over the REST API: list, create, update, and delete SIP trunks and manage per-trunk IP allowlists programmatically.

Every trunk carries its own guardrails. Restrict access to authorized IP addresses, cap concurrent channels, limit maximum call length, and set a maximum call cost, so a compromised credential or a runaway dialer can’t burn your balance.

Prefer IP authentication over registration? We support it. This is useful for SBCs, dialers, and AI voice platforms that connect by static IP instead of SIP credentials.

[API reference →](https://docs.didlogic.com/docs/api/list-sip-accounts)

How it works (3 steps)

## From signup to your first test call

1.  Step 1

    ### Register

    Create your account through one short form. No credit card to start testing.

2.  Step 2

    ### Verify

    We run a quick compliance check; profile validation completes within 24 hours. It is standard for carrier-grade voice and protects route quality for everyone on the network.

3.  Step 3

    ### Get set up with an engineer

    A sales engineer reaches out in parallel to help you connect Asterisk, FreeSWITCH, 3CX, Cisco, a softphone, or your AI voice platform. We provision a free test DID and trial credits so you can send real traffic. Many teams place a first test call the same day.

## Built for teams running real voice traffic

### AI voice agents

Connect Vapi, ElevenLabs, Retell, LiveKit, Synthflow, or Bland AI over SIP or our MCP server. SIP REFER, low-latency paths, and IP authentication for platforms that connect without SIP registration.

[Explore AI Voice →](https://didlogic.com/ai-voice/)

### Outbound telemarketing and dialers

Dialer-friendly routing with CLI rotation, AMD, and high-ASR destinations. Validate lists with HLR lookups before you dial. Capacity scales on request.

### Contact centers and BPOs

Inbound and outbound voice on one trunk. Native caller ID, low-latency routing through in-country gateways, and licensed local voice in regulated markets.

### Fintech and regulated industries

TLS signaling, SRTP media, regional data processing, and licensed local voice in regulated markets. ISO/IEC 27001:2022 certified by TÜV AUSTRIA.

### Sales teams and real estate

Local numbers, local caller IDs, and CLI rotation for better pickup rates. Traffic routed through direct carriers, not aggregators.

### CPaaS, CCaaS, and resellers

Wholesale rates, direct carrier connections, LCR, and API provisioning at scale. RouteLogic RLX access and white-label SIP trunking for resellers.

OUTBOUND PERFORMANCE

## CLI rotation, AMD, and HLR lookups for outbound teams

Outbound calls get flagged, blocked, and marked as spam more aggressively than ever. Using a single caller ID at volume is the fastest way to get a number labelled and ignored.

**CLI Rotation** lets you manage a pool of caller IDs directly from your didlogic account. Calls cycle through the pool automatically, keeping each number under spam-detection thresholds and pushing answer rates back up. Fully self-service: add and remove numbers from the portal, changes apply instantly.

**Answering machine detection (AMD)** filters voicemail pickups so your agents and bots spend time on live answers.

**HLR lookups** check whether a mobile number is live before you dial, up to 1,500 numbers per API request. Clean lists mean fewer wasted call attempts and better ASR on every campaign.

[HLR lookup API →](https://docs.didlogic.com/docs/api/create-hlr-lookup)

## Pay for traffic, not for trunks

No per-channel fees. No per-trunk fees. You pay for the calls you send, with pay-as-you-go rates that vary by destination.

[See SIP trunk call rates by country](https://didlogic.com/pricing/wholesale-international-voice/call-rates/)

## Reliable, compliant voice infrastructure with real engineering support

### Compliance & infrastructure

• **ISO 27001 and ISO 9001 certified**  
Information security and quality management independently certified by TÜV AUSTRIA, covering the systems that carry your traffic and store your CDR and DID data. See [security and compliance](https://didlogic.com/security/).

• **Regional data processing**  
Voice traffic runs through our own regional data centers. Call handling stays on domestic infrastructure where local data laws require it.

• **Licensed local voice in 17 countries**  
In regulated markets, we provision DIDs on local licenses. Outbound calls originate from in-country IPs with compliant caller IDs, so they arrive as domestic traffic rather than being blocked as foreign.

• **Encrypted signalling and media**  
TLS for signalling (port 5061), SRTP for media across inbound DIDs and outbound trunks.

• **E911 and E112 in 46 countries**  
Emergency routing where required, with address provisioning built into the portal.

### Engineering support

• **Real engineering support, during migration and after**  
Reach our engineering team directly during migration, integration, and escalations. We also respond in platform communities like Vapi Discord when customers need help in public.

• **Bring your numbers with you**  
Port existing DIDs from your current provider, with paperless LNP for supported countries.

Our team has been running voice infrastructure for 20 years, and regional engineers track regulatory and carrier changes in every market we serve.

SIP trunking technical specs

| Spec           | didlogic SIP trunking                                                                                 |
|----------------|-------------------------------------------------------------------------------------------------------|
| Protocol       | SIP over UDP, TCP, and TLS (port 5061)                                                                |
| Authentication | SIP credentials or IP-based authentication                                                            |
| Media          | RTP (ports 10000-20000), with SRTP for encrypted media                                                |
| Codecs         | G.711 u-law/a-law, G.729, GSM; G.722 HD voice supported where the far-end carrier preserves it        |
| DTMF           | RFC 2833 / RFC 4733 (RTP events) and in-band                                                          |
| Coverage       | Local and toll-free numbers in 140+ countries                                                         |
| Latency        | Sub-20ms audio on 80% of calls                                                                        |
| Network        | Own ASN (AS13006), 12 physical PoPs, direct Tier 1 peering (PCCW, GTT, Telia, NTT)                    |
| Capacity       | No per-channel or per-trunk fees. Concurrent channels and CPS raised on request                       |
| Outbound       | CLI rotation, AMD (answering machine detection), high-ASR routing, HLR lookups via API                |
| Call control   | SIP REFER for live transfer to a human agent or another endpoint; SIP URI forwarding for inbound DIDs |
| API            | REST API for SIP trunk provisioning, IP allowlists, CDRs, ASR reports, and HLR lookups                |
| Compliance     | Licensed local voice in 17 markets, E911/E112 in 46 countries, regional data processing               |

## FAQ: SIP Trunking

### What makes didlogic SIP trunking different from a typical SIP provider?

Most SIP providers resell capacity they do not own. didlogic runs its own network: our Autonomous System (AS13006), 12 physical PoPs, and direct Tier 1 peering. Traffic stays on our infrastructure end to end, which keeps latency low and gives us direct control when something needs fixing. Pricing has no per-channel and no per-trunk fees.

### Do you support IP-based SIP trunking instead of registration?

Yes. Create an account, then contact support or open a ticket from the portal, and we will set up a dedicated SIP account with IP authentication. Configure your endpoint with that account and you’re live. No SIP registration required.

### Which codecs and DTMF methods are supported?

Audio codecs: G.711 u-law (PCMU), G.711 a-law (PCMA), GSM, and G.729. You can force a specific codec on your gateway or PBX and our SBC will comply where possible. G.722 HD voice is supported, though many carriers do not preserve HD audio end-to-end, so it may not reach the subscriber endpoint on every route. DTMF: RFC 2833 / RFC 4733 (RTP events) and in-band.

### Can I forward inbound calls on a DID to a SIP URI or IP address?

Yes. Inbound calls to your DID can route directly to an IP-based destination in the format DID@ip_address:port. This is useful for SBCs, media servers, and AI voice platforms.

### Is didlogic a good fit for AI voice agents?

Yes. didlogic suits AI voice teams that need local numbers, low-latency routing, IP authentication, and SIP handoff to human agents. If your main use case is conversational AI or voice bots on real phone networks, see the [AI Voice](https://didlogic.com/ai-voice/) page for the full workflow.

### Does didlogic charge per channel or per SIP trunk?

No. There are no per-channel and no per-trunk fees. You pay for the traffic you send, with pay-as-you-go rates that vary by destination.

### How quickly can I start testing?

Profile validation completes within 24 hours of account creation, and a sales engineer reaches out in parallel. In many cases you can create an account, get a free test DID, add credit, and place your first call the same day.

### Which PBXs, softphones, and platforms are compatible?

Anything that speaks standard SIP: Asterisk, FreeSWITCH, 3CX, Cisco, common softphones, and AI voice platforms like Vapi, Retell, ElevenLabs, and LiveKit. Setup guides are published in the didlogic docs.

### Is didlogic a Twilio alternative for SIP trunking and AI voice?

For teams focused on voice infrastructure, yes. didlogic suits buyers who want SIP trunking, DID numbers, and direct telecom connectivity without paying for a broader communications layer they do not need. For a side-by-side view, see our [Twilio alternative for AI voice](https://didlogic.com/ai-voice/twilio-alternative/) page.

### Do you support T.38 for fax?

We do not guarantee fax over VoIP. Some devices handle inbound fax fine; others do not. T.38 support is not included by default and may be unavailable on some routes. If fax is critical to your workflow, talk to us before committing.

### How does didlogic handle voice quality and latency?

Short routing paths and direct carrier peering. Local traffic stays local and regional traffic stays regional, so audio holds under 20ms added latency on 80% of calls, measured across our 12 PoPs.

### Does didlogic support compliance and security requirements?

Yes. didlogic is ISO/IEC 27001:2022 and EN ISO 9001:2015 certified by TÜV AUSTRIA, with TLS signaling, SRTP media, regional data processing, and licensed local voice in 17 regulated markets.

### How much does didlogic SIP trunking cost?

There are no per-channel or per-trunk fees. You pay for the traffic you send, with pay-as-you-go rates that vary by destination. See current SIP trunk call rates by country: [/pricing/wholesale-international-voice/call-rates/](https://didlogic.com/pricing/wholesale-international-voice/call-rates/)

Free test DID, trial credits, and access to our engineering team after account review. No contract and no channel fees.