Merged revisions 310633 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r310633 | rmudgett | 2011-03-14 11:38:24 -0500 (Mon, 14 Mar 2011) | 25 lines

  "Caller*ID failed checksum" on Wildcard TDM2400P and TDM410

  The last character in the caller id message is getting a framing error.

  The checksum is the last character in the message.  A framing error in the
  checksum could be because:
  1) The sender did not send a full stop bit.
  2) The sender cut off the FSK carrier too soon.
  3) The sender opted to send zero of the specified zero to 10 trailing mark
  bits and round-off errors in the code resulted in the code not being where
  it thought it was in the demodulated bit stream.

  Bit 8 of 'b' is set when parity error.
  Bit 9 of 'b' is set when framing error.

  Made ignore the framing and parity error bits if the errored character is
  the checksum.  We can tolerate a framing/parity error there.  The checksum
  character validates the message.

  (closes issue #18474)
  Reported by: nivek
  Patches:
        callerid.c.1.patch uploaded by nivek (license 636) (with modifications)
  Tested by: nivek
........

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@310635 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/callerid.c b/main/callerid.c
index 63ccc228bbcd1b0976149aa54164651be60a47f7..3ba89df12dd0c53c5e65e97605f91015dbed3786 100644 (file)
--- a/main/callerid.c
+++ b/main/callerid.c
@@ -568,9 +568,22 @@ int callerid_feed(struct callerid_state *cid, unsigned char *ubuf, int len, int
                        return -1;
                }
                if (res == 1) {
-                       /* Ignore invalid bytes */
-                       if (b > 0xff)
-                               continue;
+                       if (b > 0xff) {
+                               if (cid->sawflag != 5) {
+                                       /* Ignore invalid bytes */
+                                       continue;
+                               }
+                               /*
+                                * We can tollerate an error on the checksum character since the
+                                * checksum character is the last character in the message and
+                                * it validates the message.
+                                *
+                                * Remove character error flags.
+                                * Bit 8 : Parity error
+                                * Bit 9 : Framing error
+                                */
+                               b &= 0xff;
+                       }
                        switch (cid->sawflag) {
                        case 0: /* Look for flag */
                                if (b == 'U')