Voice service

A dossier on how we terminate your calls

One SIP interconnect, two clearly labelled route classes, and a spec sheet your NOC can act on without a phone call to us.

01 / Scope

What we terminate

TelPrivo carries outbound SIP voice traffic from carriers, ITSPs, contact centers and business PBXs to fixed and mobile networks worldwide.

Transport	SIP over UDP, TCP or TLS
Codecs	G.711, G.729, Opus, iLBC
Fax	T.38 on supported destinations
Billing	Prepaid or postpaid, per-second after 1s
Auth	IP authentication or SIP digest

Sample INVITEPremium CLI route

INVITE sip:+4915123456789@sbc.telprivo.com SIP/2.0
Via: SIP/2.0/TLS 10.0.0.12:5061;branch=z9hG4bK...
From: "Alice" <sip:+442071234567@customer.example>
To: <sip:+4915123456789@sbc.telprivo.com>
P-Asserted-Identity: <sip:+442071234567@customer.example>
Route: <sip:premium-cli@sbc.telprivo.com;lr>
Contact: <sip:alice@10.0.0.12:5061;transport=tls>
Content-Type: application/sdp

P-Asserted-Identity is preserved end-to-end on Premium CLI routes — nothing rewrites the From header downstream.

02 / Route classes

Two classes. No blending, no surprises.

You decide which class each traffic profile takes — by destination prefix, source trunk, or a SIP header. Nothing downgrades quietly.

Property	Premium CLI	Standard
Caller ID	Original CLI preserved end-to-end	Best-effort, not guaranteed
Interconnect	Direct Tier-1 carriers	Optimized least-cost mix
Quality target	ASR > 55%, ACD > 4 min	Reliable, not benchmarked
Best for	Sales, support, callbacks	Notifications, IVR, alerts
Monitoring	Priority NOC & SLA reporting	Same platform, standard reporting

03 / Platform

Built by the engineers who run it

Carrier-grade infrastructure with active-active SBCs, deterministic routing, and independent monitoring on every leg.

Redundant SBCs

Frankfurt, Amsterdam and Ashburn, active-active with sub-second failover.

SIP over TLS 1.3

SRTP media, IP or digest auth, IPv4 and IPv6 signaling.

LCR + quality routing

Per-destination profile weighted by ASR, ACD and CLI delivery.

Anti-fraud engine

Real-time velocity, country and destination filters with automatic route removal on anomaly.

04 / Specification

What your NOC needs before we open a trunk

If your PBX speaks standard SIP, it speaks TelPrivo. This is the full sheet, not a marketing summary.

Signaling: SIP 2.0 over UDP, TCP or TLS 1.3. RFC 3261 compliant. IPv4 & IPv6.
Media: RTP or SRTP (AES-128). Symmetric RTP. NAT traversal via SBC.
Codecs: G.711 A-law/µ-law, G.729ab, Opus, iLBC. Transcoding on request.
DTMF: RFC 2833 / RFC 4733. SIP INFO on legacy destinations.
Fax: T.38 UDPTL where supported. G.711 pass-through fallback.
Authentication: IP whitelisting (preferred) or SIP digest with per-trunk credentials.
Capacity: No hard CPS/CC caps. Soft limits agreed per customer, elastic on request.
CDRs: Real-time webhook, hourly API pull, or SFTP push. RADIUS on request.

05 / Billing

Billing that respects the second

No connection fees, no minute rounding, no monthly minimums. You pay for the seconds you use, on whichever rail suits your treasury.

Prepaid

Fund by wire, card, SEPA or USDT/USDC. Balance visible in real time. Auto top-up when it crosses your threshold.

Postpaid

Weekly or bi-weekly invoicing for approved accounts. Net-14 terms. EUR, USD or GBP.

Per-second billing

First second minimum, then billed by the second. CDR shows exact duration — no 60/6 or 30/30 rounding.

See the live rate deck

Create an account to browse the full A-Z deck in your portal — Premium CLI and Standard clearly labelled, searchable by prefix or destination.

Create account