Many calls received from this number

Judging from the caller ID it looks like a spoofed number.

2010-03-05 17:08:08      "12345678915" <12345678915>      s      NO ANSWER      00:11
2010-03-05 17:06:56     "12345678915" <12345678915>     s     NO ANSWER     00:18
2010-03-05 11:08:21     "12504128815" <12504128815>     s     NO ANSWER     00:30