chan_dahdi: Populate CALLERID(ani2) for incoming calls in featdmf signaling mode.

For the featdmf signaling mode the incoming MF Caller-ID information is
formatted as follows: *${CALLERID(ani2)}${CALLERID(ani)}#*${EXTEN}#

Rather than discarding the ani2 digits, populate the CALLERID(ani2) value
with what is received instead.

AST-1368 #close
Reported by: Denis Martinez
Patches:
      extract_ani2_for_featdmf_v11.patch (license #5621) patch uploaded by Richard Mudgett


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@429783 65c4cc65-6c06-0410-ace0-fbb531ad65f3

UPGRADE.txt

@@ -20,6 +20,11 @@
 ===
 ===========================================================
 
+from 11.15 to 11.16
+chan_dahdi:
+ - The CALLERID(ani2) value for incoming calls is now populated in featdmf
+   signaling mode.  The information was previously discarded.
+
 from 11.13.0 to 11.13.1:
 
 * Due to the POODLE vulnerability (see 

channels/sig_analog.c

@@ -1994,6 +1994,8 @@ static void *__analog_ss_thread(void *data)
 		if ((p->sig == ANALOG_SIG_FEATDMF) || (p->sig == ANALOG_SIG_FEATDMF_TA)) {
 			if (exten[0] == '*') {
 				char *stringp=NULL;
+				struct ast_party_caller *caller;
+
 				ast_copy_string(exten2, exten, sizeof(exten2));
 				/* Parse out extension and callerid */
 				stringp=exten2 +1;
@@ -2011,6 +2013,11 @@ static void *__analog_ss_thread(void *data)
 				} else {
 					ast_copy_string(exten, s1 + 2, sizeof(exten));
 				}
+
+				/* The first two digits are ani2 information. */
+				caller = ast_channel_caller(chan);
+				s1[2] = '\0';
+				caller->ani2 = atoi(s1);
 			} else {
 				ast_log(LOG_WARNING, "Got a non-Feature Group D input on channel %d.  Assuming E&M Wink instead\n", p->channel);
 			}