Send info message to SIP lugin

Hi
We use janus for make audio calls through sip plugin.
When we try to send info request from our app
{“janus”:“message”,“transaction”:“DK1m7pWVSuOh”,“body”:{“request”:“info”,“type”:“call_start”,“content”:“call_start”},“session_id”:2594114861910059,“handle_id”:5739220457426704}
We got error [87010000000][nua_r_info]: 900 Internal error at nua_client.c:552
And we don’t see INFO message on sip side.
What could be the reason?

That looks like an internal error in Sofia, so no idea. When I tested SIP INFO, it worked just fine for me. Try using the buttons to send SIP INFO from the demo page we provide too, just to make it’s not a typo you’re making somewhere.