[Linphone-developers] incoming call, audio, behind NAT

[Rick Sewill]

With linphone 1.0.x (1.0.0 or 1.0.1),
I can't seem to get audio for incoming calls.

The way I test this is to go to www.freeworlddialup.com 
where I have an account, 
Select an option to "Call Me" listed in the Quick Start Guide.

I am behind NAT.  The NAT device does not understand the SIP protocol.

The ethernet sniff showed sdp_context_generate_template()
in coreapi/sdphandler.c was putting in my local (192.168.x.x)
IP address when sending the SIP/2.0 200 OK message.

I tried the following patch.
After this patch, I could hear the automated voice say,
"Welcome to Freeworld Dialup...."

I do not understand the code well enough to know if the following
patch is correct, or if there is a better patch that should be done.

===== BEGIN PATCH to linphone 1.0.1 =====
diff -Naur orig-linphone-1.0.1/coreapi/sdphandler.c
linphone-1.0.1/coreapi/sdphandler.c
--- orig-linphone-1.0.1/coreapi/sdphandler.c    2005-03-07
08:50:36.000000000 -0600
+++ linphone-1.0.1/coreapi/sdphandler.c 2005-03-26 10:42:47.012711392
-0600
@@ -256,6 +256,19 @@
   ctx->remote=remote;
   tmp=sdp_message_o_addr_get(remote);
   eXosip_get_localip_for(tmp,&ctx->localip);
+
+       if( eXosip_is_public_address(tmp))
+       {
+               char *firewall_address;
+
+               firewall_address = eXosip_get_firewallip();
+                                if (firewall_address != NULL)
+                                   {
+                                               free(ctx->localip);
+
ctx->localip = osip_strdup(firewall_address);
+              }
+              }
+
        answer = sdp_context_generate_template (ctx);
        
        /* for each m= line */
diff -Naur orig-linphone-1.0.1/exosip/eXosip.c
linphone-1.0.1/exosip/eXosip.c
--- orig-linphone-1.0.1/exosip/eXosip.c 2005-02-22 11:30:10.000000000
-0600
+++ linphone-1.0.1/exosip/eXosip.c      2005-03-26 02:13:42.000000000
-0600
@@ -56,6 +56,15 @@
 
 eXosip_t eXosip;
 
+char *eXosip_get_firewallip(void)
+{
+       if (eXosip.j_firewall_ip[0]!='\0')
+       {
+               return eXosip.j_firewall_ip;
+               }
+               return NULL;
+}
+
 void eXosip_set_firewallip(const char *firewall_address)
 {
        if (firewall_address==NULL) return;
===== END PATCH to linphone 1.0.1 =====

-- 
Rick Sewill                      Phone/FAX: +1-218-287-1075
E-mail: address@hidden    Cell Phone: +1-701-866-0266