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-rw-r--r--channels/chan_sip.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 84cbdfc26..49caddf99 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -6891,7 +6891,7 @@ static void initreqprep(struct sip_request *req, struct sip_pvt *p, int sipmetho
if (sipmethod == SIP_NOTIFY && !ast_strlen_zero(p->theirtag)) {
/* If this is a NOTIFY, use the From: tag in the subscribe (RFC 3265) */
- snprintf(to, sizeof(to), "<sip:%s>;tag=%s", p->uri, p->theirtag);
+ snprintf(to, sizeof(to), "<%s%s>;tag=%s", (strncasecmp(p->uri, "sip:", 4) ? "" : "sip:"), p->uri, p->theirtag);
} else if (p->options && p->options->vxml_url) {
/* If there is a VXML URL append it to the SIP URL */
snprintf(to, sizeof(to), "<%s>;%s", p->uri, p->options->vxml_url);