Ensure that T38FaxVersion is put into outgoing SDP in the proper case.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@212113 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -10162,7 +10162,7 @@ static enum sip_result add_sdp(struct sip_request *resp, struct sip_pvt *p, int
 
 		ast_str_append(&m_modem, 0, "m=image %d udptl t38", ntohs(udptldest.sin_port));
 
-		ast_str_append(&a_modem, 0, "a=T38Faxversion:%d\r\n", p->t38.our_parms.version);
+		ast_str_append(&a_modem, 0, "a=T38FaxVersion:%d\r\n", p->t38.our_parms.version);
 		ast_str_append(&a_modem, 0, "a=T38MaxBitRate:%d\r\n", t38_get_rate(p->t38.our_parms.rate));
 		if (p->t38.our_parms.fill_bit_removal) {
 			ast_str_append(&a_modem, 0, "a=T38FaxFillBitRemoval\r\n");