Buyer Does Not Receive the Call

First Check the Buyer's Number Format

Buyer phone numbers must be E.164 (+15555551234). A buyer
record with a domestic-format number will fail to dial and
the call router will skip it. Confirm the buyer's number on
the buyer edit screen.

SIP Routing Through External Platform

Many buyers receive calls over SIP rather than the public
telephone network. TrackDrive models this through the
external platform record attached to the buyer. When the
buyer has an external platform with SIP endpoint enabled
is true, the dialer constructs an INVITE to the platform's
sip_endpoint, substituting the buyer's number into the
[number_to_dial] placeholder.

The SIP endpoint must:

• Begin with sip:
• Contain the literal string [number_to_dial]
• Contain an @<domain> portion

Endpoints failing this validation are rejected at save
time, so a misconfigured platform will not silently swallow
calls; it will refuse to save.

sip.trackdrive.com (Inbound to TrackDrive)

For partners that originate calls into TrackDrive over SIP,
sip.trackdrive.com is the open SIP endpoint. It accepts
INVITEs without credentials or whitelisting, but only
answers when the requested DID is a number TrackDrive owns
for an active company. Calls to unknown numbers are rejected
at the SIP layer.

When Nothing Else Works

If the buyer is configured correctly, the number is in
E.164 format, and the external platform endpoint is valid,
check the call's recording and event log on the call detail
screen. The call router records every buyer it attempted,
the dial result for each, and the reason a buyer was
skipped (caps reached, schedule mismatch, hold queue
timeout). The skip reason almost always identifies the
configuration that needs to change.