SIP Trunk in Romania — Bucharest, Cluj-Napoca or Iași Inbound + Outbound

1. What a SIP trunk in Romania actually is

A SIP trunk is the IP delivery pipe between a carrier and your PBX, AI voice agent, or call-control platform; signaling over SIP, audio over RTP. A Romania SIP trunk is the same thing carrying +40 Romania DIDs allocated under ANCOM.

DIDHub provides the trunk authentication and SIP transport; ANCOM-compliant number allocation is coordinated through our in-region carrier partners. Your PBX or platform sees a standard SIP trunk; we handle the regulator-side paperwork.

2. Romania regulation: ANCOM, KYC, compliance

ANCOM doesn't require KYC for standard Romania number allocation. Activation is 1-2 business days.

What people typically use a Romania SIP trunk for:

• CEE market entry, Bucharest 021 numbers signal credibility to Romanian B2B buyers.
• Outsourcing / shared service centers, Bucharest, Cluj, Iași, Timișoara are major SSC destinations; local DIDs essential.
• Tech and SaaS, Cluj-Napoca 0264 is the "Silicon Valley of Eastern Europe" with a strong startup scene.
• Cross-CEE operations, pair Romania with Poland, Czechia, Hungary, Bulgaria DIDs for full CEE coverage.
• Toll-free 0800, free for Romanian callers, standard for customer service.

Romania's regulator ANCOM (Autoritatea Națională pentru Administrare și Reglementare în Comunicații) does not require KYC for standard geographic or 0800 toll-free numbers. Activation typically completes in 1-2 business days.

For the broader picture across countries, see our guide to international DID compliance & KYC bundles. For the SIP-trunk concept end-to-end, see the DID Number Provider guide.

3. Number types you can route over the trunk

DIDHub supports the standard Romania number types over the SIP trunk:

For a deeper look at how number types differ globally, see DID number types explained.

4. How DIDHub's SIP trunk works in Romania

The technical surface of the trunk is standardised; the Romania-specific choices are the POP, the codec list, and the failover topology.

Ingress POPs

• Frankfurt (primary), lowest in-region latency to Romania endpoints.
• London (failover), secondary route used if the primary path degrades.

Transport & security

• TLS:5061 recommended for any production trunk; UDP allowed for legacy.
• SRTP for media via DTLS-SRTP or SDES.
• SIP authentication: digest registration (PBX behind NAT) or IP-ACL (static peering). See SIP authentication.

Codecs

• G.711 a-law (PCMA), the European default.
• G.722, wideband HD voice on capable endpoints.
• Opus, for AI voice agents and IP-native softphones.
• G.729, available on request.

For the codec deep-dive, see voice codecs explained.

DTMF

• RFC 4733 (telephone-events over RTP) is the default. SIP INFO and in-band DTMF available for legacy interop on request.

Channel concurrency

• Trunks start at 5 concurrent channels and scale to 200 per trunk off the shelf. Larger requires a custom arrangement.
• Channels are independent of DID count; you can carry 200 numbers on a 10-channel trunk if your concurrent-call peak is 10. See multiple concurrent calls on one DID.

STIR/SHAKEN

• Not applicable. The North-American STIR/SHAKEN attestation framework is a US/Canada construct that doesn't exist in Europe. EU trust signals come through national regulator registration and operator-side caller-ID validation.

5. Outbound calling from your Romania trunk

Outbound from a Romania-allocated DID to Romania destinations is allowed within approved use cases. The per-minute economics:

Outbound caller-ID rules

• Your outbound CLI must match a DID you've allocated through the trunk. Setting an arbitrary caller ID is rejected at the SBC.
• Origin-based rating (OBR) applies on cross-border outbound, the regulated EEA tier may apply depending on the source carrier.
• For multi-region operators, see origin-based rating savings.

6. Setup in 6 steps

Asterisk pjsip example

; /etc/asterisk/pjsip.conf
[transport-tls]
type=transport
protocol=tls
bind=0.0.0.0:5061
cert_file=/etc/asterisk/keys/asterisk.crt
priv_key_file=/etc/asterisk/keys/asterisk.key
method=tlsv1_2

[didhub-romania]
type=auth
auth_type=userpass
username=YOUR_DIDHUB_USERNAME
password=YOUR_DIDHUB_PASSWORD

[didhub-romania]
type=aor
contact=sip:sip.didhub.io:5061;transport=tls
qualify_frequency=30

[didhub-romania]
type=endpoint
transport=transport-tls
context=from-didhub
disallow=all
allow=g711a,g722,opus
outbound_auth=didhub-romania
aors=didhub-romania
dtmf_mode=rfc4733
media_encryption=sdes
direct_media=no

3CX SIP trunk template snapshot

# 3CX -> SIP Trunks -> Add SIP Trunk -> Generic SIP Trunk
Trunk name:        DIDHub Romania
Registrar:         sip.didhub.io
Transport:         TLS
Port:              5061
Authentication:    Register/Account based
Auth ID:           YOUR_DIDHUB_USERNAME
Auth password:     YOUR_DIDHUB_PASSWORD
Outbound caller ID: +40 ... (one of your allocated DIDs)
Codecs (priority):  G.711a / G.722 / Opus

7. Integration patterns

Every modern PBX, UC platform, and AI voice stack can authenticate against the trunk:

8. Pricing

Four line items: per-DID monthly rental, per-minute inbound usage on every Romania DID (even landline geographic numbers carry an inbound MOU charge in Romania), channel capacity, and per-minute outbound. Setup is $0 once ANCOM paperwork is approved.

Per-DID monthly

Channel capacity

Per-minute outbound

See section 5 above and the full global rate sheet.

9. Porting an existing Romania number

Existing Romania number? Porting timeline is 2-4 weeks.

• Typical port time: 2-4 weeks
• Required documents: phone bill + LOA + ID + proof of address (ANCOM requirements)
• Cost: port-in fee per number; carrier-side fees may apply

For the full porting playbook (US/UK/EU + the global gotchas), see number porting explained.

10. FAQ

Which POP should I connect to for a Romania SIP trunk?

Frankfurt is the recommended primary; London is the standard failover. Both terminate to Romania via in-region carriers.

How long does activation take for a Romania SIP trunk?

1-2 business days after KYC documents are accepted (or instantly where KYC isn't required). Provisioning the SIP side itself is hours, not days; the variability is on the ANCOM/carrier side.

What codecs should I configure for a Romania SIP trunk?

G.711a / G.722 / Opus as the negotiation list, in that order. G.711a is the regional default for Romania interop.

Can I use my Romania SIP trunk with Microsoft Teams?

Yes, via Microsoft Teams Direct Routing through DIDHub's managed SBC. See Teams Direct Routing.

Can I use my Romania SIP trunk with AI voice agents (Vapi, Retell, ElevenLabs)?

Yes, BYOC SIP trunk works with every major AI voice platform. Bind specific Romania DIDs to specific agents; outbound CLI must match an allocated DID.

How many concurrent calls can one Romania DID handle?

The DID is an address; concurrent-call capacity is set by the channel count on the trunk. A 50-channel trunk with 1 DID can carry 50 concurrent calls to that one number; the same trunk with 200 DIDs can carry 50 concurrent calls across any combination of those numbers.

Does STIR/SHAKEN apply in Romania?

N/A (regional construct). Trust signals come instead through national regulator registration and operator-side caller-ID validation.

Can I port my existing Romania number to a DIDHub SIP trunk?

Yes. Typical Romania port timeline is 2-4 weeks. Required documents vary by number type; contact us for the specific checklist. See number porting explained for the global picture.

What use cases get approved most easily?

Customer service inbound, opted-in callbacks, transactional 2FA, inbound AI voice agents, and Microsoft Teams Direct Routing for registered entities. Cold outbound, unsolicited SMS campaigns, and anonymous-relay setups are routinely rejected.

11. Related country pages