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-rw-r--r--channels/chan_sip.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index b02d0a7e1..2d4ab866a 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -6113,8 +6113,9 @@ static int add_t38_sdp(struct sip_request *resp, struct sip_pvt *p)
ast_build_string(&a_modem_next, &a_modem_left, "a=T38FaxMaxDatagram:%d\r\n",x);
if (p->t38.jointcapability != T38FAX_UDP_EC_NONE)
ast_build_string(&a_modem_next, &a_modem_left, "a=T38FaxUdpEC:%s\r\n", (p->t38.jointcapability & T38FAX_UDP_EC_REDUNDANCY) ? "t38UDPRedundancy" : "t38UDPFEC");
+ len = strlen(v) + strlen(s) + strlen(o) + strlen(c) + strlen(t);
if (p->udptl)
- len = strlen(m_modem) + strlen(a_modem);
+ len += strlen(m_modem) + strlen(a_modem);
add_header(resp, "Content-Type", "application/sdp");
add_header_contentLength(resp, len);
add_line(resp, v);