VoxioTelecom
Documentation

Everything you need to integrate in an afternoon.

Concrete SIP examples, endpoint URLs, sample dialplans and a full API reference. Written by engineers, not by marketing.

Getting started

Create an account, top up in crypto and receive your SIP trunk in under 60 seconds.

SIP trunk setup

Register or IP-auth against our SBC. Codec, DTMF and CLI parameters.

Authentication modes

IP whitelist (recommended for PBX) or username/password (softphones, dev).

Codecs & media

G.711 A/µ-law, G.729, Opus. RTP ports, SRTP and TLS transport.

Billing & top-up

Per-second billing, auto-topup with BTC / USDT-TRC20 / ETH via Plisio.

Rate deck

Live rate lookup, prefix matching and Premium CLI classification.

REST API

Programmatic access to balance, CDRs and rate deck via signed requests.

Troubleshooting

Common SIP response codes, PDD/ASR issues and how to open a ticket.

Getting started

  1. 1. Create an account at voxiotelecom.com/auth. No KYC for accounts up to $500/month.
  2. 2. Top up in crypto — go to Portal → Funds and generate a payment. We support BTC, USDT-TRC20 and ETH. Balance credits automatically after 1 confirmation (BTC) or instant for TRC20.
  3. 3. Create a SIP trunk from Portal → SIP Trunks. Choose IP auth (paste your PBX public IP) or user/password.
  4. 4. Point your PBX at sip.voxiotelecom.com:5060 and start calling.

SIP trunk setup

Endpoints

SIP host
sip.voxiotelecom.com
SIP port (UDP/TCP)
5060
SIP port (TLS)
5061
RTP range
10000-20000/UDP
Registrar
sip.voxiotelecom.com

Number format

Always dial in E.164 without the leading +.

  • 4930901820 → Germany, Berlin
  • 12125551234 → USA, NYC
  • 18005551234 → USA Toll-Free

Sample Asterisk (pjsip.conf)

[voxio]
type=endpoint
transport=transport-udp
context=from-voxio
disallow=all
allow=alaw,ulaw,g729
outbound_auth=voxio-auth
aors=voxio-aor
from_user=YOUR_SIP_USER
from_domain=sip.voxiotelecom.com
direct_media=no

[voxio-auth]
type=auth
auth_type=userpass
username=YOUR_SIP_USER
password=YOUR_SIP_PASSWORD

[voxio-aor]
type=aor
contact=sip:sip.voxiotelecom.com:5060

Authentication modes

IP whitelist (recommended)

Best for carriers, PBXes and dedicated SBCs with a static public IP. No registration needed — we authenticate calls by source IP.

You can whitelist up to 10 IPs per trunk.

Username / password

Good for softphones, dev environments or PBXes behind NAT with dynamic IPs. Uses SIP digest auth.

Credentials are generated when you create the trunk — visible only once.

Codecs & media

Supported codecs, in preference order: G.711 A-law, G.711 µ-law, G.729, Opus. DTMF is negotiated as RFC 2833 (out-of-band) by default; SIP INFO available on request.

SRTP over TLS is available on port 5061 for privacy-sensitive deployments. Media is anchored on our SBC; direct media is disabled.

Billing & top-up

Prepaid, per-second billing with no rounding penalty (1s minimum, 1s increment). Every call generates a CDR available in Portal → CDRs and via API.

Top up in Bitcoin, USDT (TRC20) or Ethereum. Payments are processed by Plisio; funds are credited to your MBilling balance automatically once the transaction confirms on-chain.

Auto-topup can be enabled from Portal → Funds → Auto-topup — we generate a fresh crypto invoice whenever your balance falls below the threshold you set.

Rate deck

Rates are quoted in USD per minute and use longest-prefix matching. Routes are classified as either Standard or Premium CLI — the latter guarantees caller ID delivery contractually.

Rate changes are notified 7 days in advance for decreases and 14 days in advance for increases. Historical rate decks are available on request.

REST API

Generate an API key from Portal → API Keys. Requests are authenticated via Authorization: Bearer <secret>.

Endpoints

  • GET /api/v1/balance
  • GET /api/v1/rates?prefix=49
  • GET /api/v1/cdrs?from=2026-01-01&to=2026-01-31
  • POST /api/v1/topup  (crypto invoice)

Full OpenAPI spec available on request — email api@voxiotelecom.com.

Troubleshooting

403 Forbidden

Source IP not whitelisted on the trunk, or userpass credentials wrong.

404 Not Found

Number not in E.164 (leading + or missing country code).

402 Payment Required

Insufficient balance. Top up in Portal → Funds.

503 Service Unavailable

All routes to that destination are temporarily degraded. Retry or open a ticket.

486 Busy Here

Called party is busy — pass-through from the destination carrier.

487 Request Terminated

Caller hung up before the call was answered.

Still stuck? Open a ticket at Portal → Support or email noc@voxiotelecom.com. NOC is 24/7.

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