创建tcp config android pjsip时,pjsip_eunsuptransport[status=171060]

在Android中为PJSIP创建TCP配置时,出现以下错误。

Unable to generate suitable Contact header for registration: Unsupported transport (PJSIP_EUNSUPTRANSPORT) [status=171060]
D/SipTag: Sun Unable to create registration: Unsupported transport (PJSIP_EUNSUPTRANSPORT) [status=171060]

这是我的密码

endpoint?.libInit(epConfig)

// configure transport layer
val transportConfig = TransportConfig()
val pathToCerts = ctx.filesDir.absolutePath

val certPath = "$pathToCerts/cl.pem"
val caPath = "$pathToCerts/ch.pem"
val keyPath = "$pathToCerts/p.key"
transportConfig.tlsConfig.certFile = certPath
transportConfig.tlsConfig.caListFile.plus(caPath)
transportConfig.tlsConfig.privKeyFile = keyPath
transportConfig.tlsConfig.verifyServer = true
endpoint?.transportCreate(PJSIP_TRANSPORT_TCP, transportConfig)
endpoint?.libStart()

我搜了很多遍,尝试了不同的东西,但都没用。我这里有什么东西不见了吗?