* #5952: fix "string constant to char*" warnings

sflphone-common/src/sip/sdp.cpp

@@ -266,14 +266,14 @@ void Sdp::setTelephoneEventRtpmap(pjmedia_sdp_media *med)
     pjmedia_sdp_attr *attr_fmtp = NULL;
 
     attr_rtpmap = static_cast<pjmedia_sdp_attr *>(pj_pool_zalloc(memPool, sizeof(pjmedia_sdp_attr)));
-    attr_rtpmap->name = pj_str("rtpmap");
-    attr_rtpmap->value = pj_str("101 telephone-event/8000");
+    attr_rtpmap->name = pj_str((char *) "rtpmap");
+    attr_rtpmap->value = pj_str((char *) "101 telephone-event/8000");
 
     med->attr[med->attr_count++] = attr_rtpmap;
 
     attr_fmtp = static_cast<pjmedia_sdp_attr *>(pj_pool_zalloc(memPool, sizeof(pjmedia_sdp_attr)));
-    attr_fmtp->name = pj_str("fmtp");
-    attr_fmtp->value = pj_str("101 0-15");
+    attr_fmtp->name = pj_str((char *) "fmtp");
+    attr_fmtp->value = pj_str((char *) "101 0-15");
 
     med->attr[med->attr_count++] = attr_fmtp;
 }

sflphone-common/src/sip/sipvoiplink.cpp

@@ -4431,7 +4431,7 @@ void transfer_client_cb (pjsip_evsub *sub, pjsip_event *event)
 
         pjsip_rx_data *rdata;
         pjsip_generic_string_hdr *refer_sub;
-        const pj_str_t REFER_SUB = { "Refer-Sub", 9 };
+        const pj_str_t REFER_SUB = { (char *) "Refer-Sub", 9 };
 
  	/* Must be receipt of response message */
         pj_assert(event->type == PJSIP_EVENT_TSX_STATE &&