Backport: no codecs when receiving update_rtp_peer lead to segfault. (Reported and Tested by Vladimir Karpov).

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5622 43c1dc8c-776e-4df2-8ef1-6e829299be21
Enhancement: Added debug output when redial is called without a lastnumber stored

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5623 43c1dc8c-776e-4df2-8ef1-6e829299be21