Audio Stutters when Streaming Tone to X-Lite/SJPhone

One mailing list member tried to stream a .WAV file containing tone to X-Lite and SJPhone and observed audio "stutters" in the receiving side. But this didn't happen when the receiving side is another pjsua.

Solution: don't send tone file to these user agents, as it's suspected that they try to do something with the in-band tone. Use .WAV file containing usual speech and it should be okay.