Connecting ViciDial to a Flat-Rate SIP Trunk: Step-by-Step

Why Flat-Rate Matters for ViciDial Operators

Per-minute billing punishes exactly what ViciDial is designed to do: dial fast and dial often. A 50-agent predictive floor running at a 3:1 dial ratio generates thousands of connected minutes daily. At $0.008–$0.015 per minute (typical retail SIP), that is $1,200–$2,250 per day before a single deal closes.

UnlimCall's flat-rate network bills by the seat, not the minute. At $99 per seat per month for US/Canada routes (floor price; daily billing available at monthly ÷ 20), 50 seats costs $4,950 per month — regardless of how many minutes your predictive algorithm burns through. The math flips: more dials become *free*, not expensive.

Visit the UnlimCall pricing page to model your floor.

Step 1: Add a SIP Carrier in ViciDial Admin

1. Log into ViciDial Admin → Carriers → Add New Carrier.
2. Set Protocol to SIP.
3. Enter the SIP host provided in your UnlimCall dashboard (format: sip.unlimcall.com or your assigned regional hostname).
4. Set Account and Password if your trunk uses registration-based auth. For IP-based auth (recommended for static server deployments), leave these blank and whitelist your server's egress IP in the portal instead.
5. Set Outbound CallerID to a placeholder — you will override this per-campaign (see Step 4).
6. Leave Active set to Y.

Step 2: Configure Asterisk Trunk Settings

ViciDial runs on Asterisk. Open /etc/asterisk/sip.conf or the equivalent pjsip.conf section your build uses and add a trunk definition:

• type: peer (sip.conf) or endpoint/aor/auth (pjsip.conf)
• host: your UnlimCall SIP host
• insecure: port,invite (for IP-auth trunks)
• dtmfmode: rfc2833
• disallow: all
• allow: ulaw,alaw,opus (G.711 µ-law and A-law are mandatory; OPUS if your deployment supports it)
• fromuser: your account identifier from the portal
• fromdomain: your UnlimCall SIP domain

Reload Asterisk: asterisk -rx "sip reload" or asterisk -rx "pjsip reload".

Step 3: Create a Dial Plan Entry

In ViciDial Admin → Dial Plan, add a rule that routes outbound calls through your new carrier:

• Dial Prefix: leave blank for all-calls, or enter 1 for North American 11-digit dialing
• Carrier: select the carrier you created in Step 1
• Active: Y

If you operate across multiple countries, create one dial-plan entry per country code and assign the appropriate carrier or carrier group. UnlimCall routes are live across 33 markets from a single trunk — you do not need separate carrier accounts per country.

Step 4: Set Outbound Caller ID per Campaign

ViciDial lets you set caller ID at the campaign level, which is the right layer for most operations.

In Campaign Detail → Outbound CID, enter the full E.164 number you want presented (e.g., +12025550100). This number must be provisioned on your UnlimCall account for the target market.

UnlimCall delivers caller ID on demand from your provisioned number inventory — there is no shared pool, no rotation roulette, no mystery number appearing on your recipients' phones. Every CID presented is one you explicitly provisioned.

For STIR/SHAKEN signing (US and Canada only), calls placed with verified numbers receive A-attestation automatically when UnlimCall is the originating carrier. See how STIR/SHAKEN attestation works for the technical details.

Step 5: Test Before Going Live

Before enabling the carrier for production campaigns:

1. Place a test call from the ViciDial console: asterisk -rx "channel originate SIP/yourtrunk/+12025550100 extension s@default"
2. Confirm the call routes, audio is clean (G.711, no transcoding artifacts), and the correct caller ID appears on the destination.
3. Check Asterisk logs at /var/log/asterisk/full for any 403/407 auth errors or codec negotiation failures.
4. Run a short 5-agent live test campaign before cutting over full production traffic.

Step 6: Migrate Existing Campaigns

Once testing passes, update each campaign's carrier assignment to your new flat-rate trunk. Do this during off-peak hours. ViciDial does not require a restart for carrier reassignment — changes take effect on the next dialing cycle.

If you have multiple ViciDial servers in a cluster, repeat Steps 1–5 on each Asterisk node. The UnlimCall trunk handles concurrent sessions from multiple origination IPs — just register all server IPs in your portal account.