Once in a while, the same questions are asked in this mailing list about Unicall and MFCR2. I wrote a document in spanis about 2 months ago about MFCR2 signaling and how to debug it with testcall. I have translated the document into english per users request, and made some other improvements. The document can be found at: http://moy.ivsol.net/unicall/mfcr2-asterisk-unicall-0.2-english.pdf Any corrections or suggestions to the document will be appreciated. Regards -- "Su nombre es GNU/Linux, no solamente Linux, mas info en http://www.gnu.org"