Increment session version each time we send a new SDP

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1789 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index d160944..4daa51f 100755 (executable)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -202,6 +202,8 @@ static struct sip_pvt {
        int progress;                                           /* Have sent 183 message progress */
        int tag;                                                        /* Another random number */
        int nat;                                                        /* Whether to try to support NAT */
+       int sessionid;                                          /* SDP Session ID */
+       int sessionversion;                                     /* SDP Session Version */
        struct sockaddr_in sa;                          /* Our peer */
        struct sockaddr_in redirip;                     /* Where our RTP should be going if not to us */
        struct sockaddr_in vredirip;            /* Where our Video RTP should be going if not to us */
@@ -2446,6 +2448,11 @@ static int add_sdp(struct sip_request *resp, struct sip_pvt *p, struct ast_rtp *
                ast_log(LOG_WARNING, "No way to add SDP without an RTP structure\n");
                return -1;
        }
+       if (!p->sessionid) {
+               p->sessionid = getpid();
+               p->sessionversion = p->sessionid;
+       } else
+               p->sessionversion++;
        ast_rtp_get_us(p->rtp, &sin);
        if (p->vrtp)
                ast_rtp_get_us(p->vrtp, &vsin);
@@ -2477,7 +2484,7 @@ static int add_sdp(struct sip_request *resp, struct sip_pvt *p, struct ast_rtp *
        if (sipdebug && p->vrtp)
                ast_verbose("Video is at %s port %d\n", inet_ntoa(p->ourip), ntohs(vsin.sin_port));     
        snprintf(v, sizeof(v), "v=0\r\n");
-       snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", getpid(), getpid(), inet_ntoa(dest.sin_addr));
+       snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", p->sessionid, p->sessionversion, inet_ntoa(dest.sin_addr));
        snprintf(s, sizeof(s), "s=session\r\n");
        snprintf(c, sizeof(c), "c=IN IP4 %s\r\n", inet_ntoa(dest.sin_addr));
        snprintf(t, sizeof(t), "t=0 0\r\n");