Hi I am using the latest version of PJSIP (checked out SVN today in the morning). I am able to compile it, but when I'm using it in my application, and I am having some linker problems: Error 1 error LNK2019: unresolved external symbol _srtp_init referenced in function _pjmedia_srtp_init_lib pjmedia.lib Error 2 error LNK2019: unresolved external symbol _octet_string_hex_string referenced in function _pjmedia_transport_srtp_start pjmedia.lib Error 3 error LNK2019: unresolved external symbol _srtp_dealloc referenced in function _pjmedia_transport_srtp_start pjmedia.lib Error 4 error LNK2019: unresolved external symbol _srtp_create referenced in function _pjmedia_transport_srtp_start pjmedia.lib Error 5 error LNK2019: unresolved external symbol _srtp_protect referenced in function _transport_send_rtp pjmedia.lib Error 6 error LNK2019: unresolved external symbol _srtp_protect_rtcp referenced in function _transport_send_rtcp2 pjmedia.lib Error 7 error LNK2019: unresolved external symbol _srtp_unprotect referenced in function _srtp_rtp_cb pjmedia.lib Error 8 error LNK2019: unresolved external symbol _srtp_unprotect_rtcp referenced in function _srtp_rtcp_cb pjmedia.lib Error 9 error LNK2019: unresolved external symbol _crypto_get_random referenced in function _generate_crypto_attr_value pjmedia.lib Error 10 fatal error LNK1120: 9 unresolved externals (...) It seems like there is some problem with "strp.c". I tried to figure out what was wrong: it seems like this file is part of an "libSRTP" project, which I've been unable to compile so far, because of this: Error 1 fatal error C1083: Cannot open include file: 'srtp_config.h': No such file or directory (...)\third_party\srtp\crypto\include\integers.h 50 Even if I create an empty srtp_config.h file, I have other compiler errors, such as: Error 68 error C2054: expected '(' to follow 'inline' (...)\third_party\srtp\crypto\include\datatypes.h 412 I am using Visual Studio C++ 2005 Express Edition, and I was able to successfully use the previous version of PJSIP in my application. What shall I do to fix this problem? Cheers Pedro Gon?alves