VoIPMediaSession - send SIP OPTIONS periodically to keep the connection

[ydan87]

Hi there,
I have a server that uses SIPSorcery to connect to Twilio and initiate calls by creating VoIPMediaSession instance.
I'm experiencing sometimes issues that some SIP requests (mostly BYEs) don't arrive to the destination resulting some "retransmits" that also never suceeds.
In Twilio I found the following information:

How can I use VoIPMediaSession to periodically send SIP OPTIONS to Twilio so they won't close my connections? I saw an example regarding RTSP clients but not VoIPMediaSessions...

Thanks in advance...

[ydan87]

After much digging, I've found the way, via the UserAgent:

if (agent.Dialogue != null)
{
    SIPRequest optionsReq = agent.Dialogue.GetInDialogRequest(SIPMethodsEnum.OPTIONS);
    SIPNonInviteTransaction optionsTransaction = new SIPNonInviteTransaction(_sipTransport, optionsReq, null);
    optionsTransaction.SendRequest();
}