VOIP/SIP新手呼叫时遇pjmedia_endpt_create_base_sdp断言失败求助

我是一名刚接触VOIP和SIP的大学生，已经完成SIP服务器搭建并成功注册账号，但发起呼叫时触发以下错误：

10:43:18.461 pjsua_acc.c ..Acc 0: Registration sent
10:43:18.461 pjsua_call.c Making call with acc #0 to sip:132@172.10.0.151
10:43:18.461 pjsua_media.c .Call 0: initializing media..
softphone: ../src/pjmedia/endpoint.c:935: pjmedia_endpt_create_base_sdp: Assertion `!"Invalid address family"' failed. Aborted

因为之前遇到权限错误和无音频设备错误，我在代码里禁用了音频，怀疑问题出在这段代码：

// Make a call with audio disabled
CallOpParam prm(true); // Pass true to indicate this is an outgoing call
prm.opt.audioCount = 0; // Disable audio

// Debugging info for call setup
try {
    MyCall *call = new MyCall(acc);
    call->makeCall("sip:133@192.168.123.80", prm);
    cout << "*** Call setup completed ***" << endl;
} catch (Error &err) {
    cout << "Error during call setup: " << err.info() << endl;
}

问题原因 #

仅设置audioCount=0禁用音频时，PJSUA仍会尝试初始化媒体会话并生成SDP，但此时未正确绑定有效地址，导致地址族校验断言失败。

修复方案 #

1. 完全禁用媒体会话 #

在CallOpParam配置中添加PJSUA_CALL_NO_MEDIA标志，跳过所有媒体初始化逻辑：

prm.opt.videoCount = 0; // 同时禁用视频
prm.opt.flag |= PJSUA_CALL_NO_MEDIA; // 强制不创建媒体流

2. 全局配置禁用媒体 #

如果你的软phone不需要任何媒体功能，可在端点初始化时全局配置：

EpConfig ep_cfg;
ep_cfg.mediaConfig.audioCount = 0;
ep_cfg.mediaConfig.videoCount = 0;
ep_cfg.uaConfig.ipv6Enabled = false; // 匹配服务器IP协议（IPv4/IPv6）

3. 修复后的完整代码 #

// Make a call with audio disabled
CallOpParam prm(true); // Pass true to indicate this is an outgoing call
prm.opt.audioCount = 0; // Disable audio
prm.opt.videoCount = 0; // Disable video
prm.opt.flag |= PJSUA_CALL_NO_MEDIA; // Skip media initialization entirely

// Debugging info for call setup
try {
    MyCall *call = new MyCall(acc);
    call->makeCall("sip:133@192.168.123.80", prm);
    cout << "*** Call setup completed ***" << endl;
} catch (Error &err) {
    cout << "Error during call setup: " << err.info() << endl;
}

内容的提问来源于stack exchange，提问作者Sumit Rana