Connect a Vonage Number to Famulor
This guide connects a Vonage phone number to Famulor via Elastic SIP Trunking.Famulor has no dedicated Vonage import feature. You set up an Elastic SIP Trunk in Vonage and connect it through Integrate SIP trunk in Famulor.The trunk has two directions:
- Termination (outbound calls): Vonage gives you a SIP domain + credentials that Famulor uses to send outbound calls.
- Origination (inbound calls): Vonage forwards calls to Famulor’s SIP address.
How it works
- Inbound: Famulor does not register via SIP REGISTER. Vonage sends calls through the origination to „Our SIP address”.
- Outbound: Famulor sends calls to Vonage’s termination SIP domain and authenticates with username and password.
Prerequisites
- An active Vonage account with access to Programmable SIP / Elastic SIP Trunking
- At least one Vonage phone number (or a new number to purchase)
- A Famulor account
Step 1: Create an Elastic SIP Trunk in Vonage
- Open the Vonage dashboard and navigate to the SIP section.
- Create a new SIP trunk and select „Something else” as the provider (i.e. not a preset provider).
Step 2: Set up Termination (outbound calls)
Termination provides the SIP domain and credentials Famulor uses to send outbound calls.- Follow the Termination setup in Vonage.
- Note the displayed values:
Store the SIP domain, username and password safely. You need them in Step 5 for the Famulor setup.
Step 3: Set up Origination (inbound calls)
In Origination you define where Vonage forwards incoming calls – to Famulor’s SIP address.- In a second tab, open Famulor at app.famulor.de/phone-numbers?lang=en → Your phone numbers → + Integrate SIP trunk and, under Incoming call settings, copy the value Our SIP address (e.g.
xxxxxx.eu.sip.livekit.cloud). - Paste this address into Vonage under Origination as the SIP-URI.
Use the exact „Our SIP address” from Famulor – no spaces.
Step 4: Assign a number to the trunk
Link a phone number to your Elastic SIP Trunk – either an existing number or a newly purchased one.
Note the Vonage number in E.164 format with country code (e.g.
+12025550123). You need it in Step 5.Step 5: Set up the SIP trunk in Famulor
- In Famulor, go to Your phone numbers and click + Integrate SIP trunk.
- Enter the data as follows:
- Under Incoming call settings, you’ll see Our SIP address – the same address you entered as the Vonage origination in Step 3.
- Click Add SIP number.
Step 6: Assign an assistant and test
- Open Assistants in Famulor and edit the assistant you want to use.
- Select the correct inbound type (incoming calls).
- Choose your connected Vonage phone number from the list.
- Click Save assistant.
- Place a test call to your Vonage number and check that the AI assistant answers.
Call transfer to a human (warm transfer)
Famulor can hand off an ongoing call to a real person. For Vonage, use the warm transfer only – cold transfer does not work over the Vonage trunk (see the note below). For the general setup, see Assistant call forwarding.Transfer target: phone number or custom SIP
You specify the warm transfer target in one of two ways:- Supervisor phone number: the contact’s phone number (e.g.
+49 1512 3456789). - (Advanced) Custom SIP/Extension: enable this to specify a custom SIP address or internal extension instead of a phone number (field Custom SIP transfer, e.g.
sip:number@sip-server).
Warm transfer settings
In Summary instructions, Briefing initial message and similar fields you can use variables:
{customer_phone} (the caller’s number) and lead variables such as {name} or {email}.Common issues
Inbound calls do not arrive
Inbound calls do not arrive
Check the origination in Vonage (Step 3): it must contain the exact „Our SIP address” from Famulor. Also make sure the number is assigned to the trunk (Step 4).
Outbound calls fail
Outbound calls fail
Check the termination values from Step 2 in Famulor: SIP address (
<your-prefix>.sip.vonage.com), username and password. Set the number format to International (with leading +).Wrong or unknown SIP address
Wrong or unknown SIP address
Always use the exact „Our SIP address” from Famulor (Phone numbers → Integrate SIP trunk → Incoming call settings).
Cold transfer does not work
Cold transfer does not work
Vonage does not support SIP REFER, which Famulor uses for cold transfer. Use the warm transfer instead – it creates a new SIP INVITE and merges the calls (no REFER), so it works with Vonage. Details: Assistant call forwarding.