res/res_rtp_asterisk: fix skip in rtp sequence numbers after dtmf

When generating dtmfs, asterisk can incorrectly think packet loss
occured during the dtmf generation, resulting in a jump in sequence
numbers when forwarding voice frames resumes.  This patch forces
asterisk to re-learn the expected sequence number after each DTMF
to avoid this

ASTERISK-29869 #close

Change-Id: Icc7de3d947b207b82c99d3c327af8095884df853

diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index 702408192983b049e6f18e70789e3f358f0e064a..0f85a147759daae32e60c5d27a6926ded9bb46b8 100644 (file)
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -4359,6 +4359,9 @@ cleanup:
        rtp->sending_digit = 0;
        rtp->send_digit = 0;
 
+       /* Re-Learn expected seqno */
+       rtp->expectedseqno = -1;
+
        return res;
 }