diff -urN asterisk-1.6.1.11/channels/chan_sip.c asterisk-1.6.1.11-constantssrc-debug/channels/chan_sip.c
--- asterisk-1.6.1.11/channels/chan_sip.c	2009-11-30 15:51:28.000000000 -0500
+++ asterisk-1.6.1.11-constantssrc-debug/channels/chan_sip.c	2009-12-03 21:17:18.000000000 -0500
@@ -4763,6 +4763,7 @@
 		ast_rtp_set_rtpholdtimeout(dialog->rtp, peer->rtpholdtimeout);
 		ast_rtp_set_rtpkeepalive(dialog->rtp, peer->rtpkeepalive);
 		if (ast_test_flag(&dialog->flags[1], SIP_PAGE2_CONSTANT_SSRC)) {
+			ast_verbose("create_addr_from_peer: setting constantsrc flag for audio\n");
 			ast_rtp_set_constantssrc(dialog->rtp);
 		}
 		/* Set Frame packetization */
@@ -4776,6 +4777,7 @@
 		ast_rtp_set_rtpholdtimeout(dialog->vrtp, peer->rtpholdtimeout);
 		ast_rtp_set_rtpkeepalive(dialog->vrtp, peer->rtpkeepalive);
 		if (ast_test_flag(&dialog->flags[1], SIP_PAGE2_CONSTANT_SSRC)) {
+			ast_verbose("create_addr_from_peer: setting constantsrc flag for video\n");
 			ast_rtp_set_constantssrc(dialog->vrtp);
 		}
 	}
@@ -6766,6 +6768,11 @@
 		ast_rtp_set_rtptimeout(p->rtp, global_rtptimeout);
 		ast_rtp_set_rtpholdtimeout(p->rtp, global_rtpholdtimeout);
 		ast_rtp_set_rtpkeepalive(p->rtp, global_rtpkeepalive);
+		if (ast_test_flag(&p->flags[1], SIP_PAGE2_CONSTANT_SSRC)) {
+			ast_verbose("sip_pvt: setting constantsrc flag for audio\n");
+                        ast_rtp_set_constantssrc(p->rtp);
+                }
+
 		if (p->vrtp) {
 			ast_rtp_setqos(p->vrtp, global_tos_video, global_cos_video, "SIP VRTP");
 			ast_rtp_setdtmf(p->vrtp, 0);
@@ -6773,6 +6780,10 @@
 			ast_rtp_set_rtptimeout(p->vrtp, global_rtptimeout);
 			ast_rtp_set_rtpholdtimeout(p->vrtp, global_rtpholdtimeout);
 			ast_rtp_set_rtpkeepalive(p->vrtp, global_rtpkeepalive);
+			if (ast_test_flag(&p->flags[1], SIP_PAGE2_CONSTANT_SSRC)) {
+				ast_verbose("sip_pvt: setting constantsrc flag for video\n");
+                        	ast_rtp_set_constantssrc(p->vrtp);
+	                }
 		}
 		if (p->trtp) {
 			ast_rtp_setqos(p->trtp, global_tos_text, global_cos_text, "SIP TRTP");
@@ -18989,9 +19000,11 @@
 			}
 			if (ast_test_flag(&p->flags[1], SIP_PAGE2_CONSTANT_SSRC)) {
 				if (p->rtp) {
+					ast_verbose("handle_request_invite: setting constantsrc flag for audio\n");
 					ast_rtp_set_constantssrc(p->rtp);
 				}
 				if (p->vrtp) {
+					ast_verbose("handle_request_invite: setting constantsrc flag for video\n");
 					ast_rtp_set_constantssrc(p->vrtp);
 				}
 			}
diff -urN asterisk-1.6.1.11/main/rtp.c asterisk-1.6.1.11-constantssrc-debug/main/rtp.c
--- asterisk-1.6.1.11/main/rtp.c	2009-11-30 12:51:16.000000000 -0500
+++ asterisk-1.6.1.11-constantssrc-debug/main/rtp.c	2009-12-03 21:24:30.000000000 -0500
@@ -2619,7 +2619,12 @@
 	if (rtp) {
 		rtp->set_marker_bit = 1;
 		if (!rtp->constantssrc) {
+			unsigned int prev_ssrc = rtp->ssrc;
 			rtp->ssrc = ast_random();
+			ast_verbose("ast_rtp_new_source: constantssrc is %d, prev ssrc is %d, ssrc is %d\n", rtp->constantssrc, prev_ssrc, rtp->ssrc);
+		}
+		else {
+			ast_verbose("ast_rtp_new_source: constantssrc is %d, ssrc is %d\n", rtp->constantssrc, rtp->ssrc);
 		}
 	}
 }