pjsua-conf-connect: Assertion failed

[iMot4k]

Hi, I got everything setup as described in the INSTALL.md.

When I get voipwardialer to setup a call with a SIP extension, it throws an 'unknown to google' error:

Registering sip:10.20.104.250
Registration completed (sip:10.20.104.250) status= 200 (OK)
Dialing 229 with modem V23-8n1
Calling 229
Call with sip:229@10.20.104.250
is CALLING
last code = 0
()
#############
Not managed state: 1
Call with sip:229@10.20.104.250
is EARLY
last code = 180
(Ringing)
#############
Not managed state: 3
Call with sip:229@10.20.104.250
is CONNECTING
last code = 200
(OK)
#############
Connecting
Media is now active
Call with sip:229@10.20.104.250
is CONFIRMED
last code = 200
(OK)
#############
Call Media state is ACTIVE
Call answered
Remote endpoint connected
Calling modem Endpoint
Call with sip:229@10.20.104.250
is CONFIRMED
last code = 200
(OK)
#############
Call Media state is ACTIVE
Call answered
Remote endpoint connected
Calling modem Endpoint
Modem Media state is ACTIVE
Modem Connected
Bridging call & modem
python3: ../src/pjsua-lib/pjsua_aud.c:1005: pjsua_conf_connect2: Assertion `source >= 0 && sink >= 0' failed.
Aborted

I'm running on a raspberry pi 4 with debian.

Thanks!