I recently came across a free SIP book from Avaya:<http://www1.avaya.com/pc/SIP_for_Dummies.pdf <http://www.linkedin.com/e/c4sbhp-hbhx94p4-l/plh/http%3A%2F%2Fwww1%2Eavaya%2Ecom%2Fpc%2FSIP_for_Dummies%2Epdf/sPIJ/?hs=false&tok=2qYO1z2WSva5A1>>
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