Telephone is a VoIP program which allows you to make phone calls over the internet. It can be used to call regular phones via any appropriate SIP provider. If your office or home phone works via SIP, you can use that phone number on your Mac anywhere you have decent internet connection.

Building

Telephone's SIP user agent is based on pjsip. You need to build it before building Telephone. Name the directory pjproject and place it near Telephone, in the same parent directory.

$ svn checkout http://svn.pjsip.org/repos/pjproject/tags/2.1 pjproject
$ cd pjproject

Create the file pjlib/include/pj/config_site.h with the following contents:

#define PJMEDIA_AUDIO_DEV_HAS_PORTAUDIO 0
#define PJMEDIA_AUDIO_DEV_HAS_COREAUDIO 1
#define PJSIP_DONT_SWITCH_TO_TCP 1
#define PJSUA_MAX_ACC 32
#define PJMEDIA_RTP_PT_TELEPHONE_EVENTS 101
#define PJMEDIA_RTP_PT_TELEPHONE_EVENTS_STR "101"
#define PJ_DNS_MAX_IP_IN_A_REC 32
#define PJ_DNS_SRV_MAX_ADDR 32
#define PJSIP_MAX_RESOLVED_ADDRESSES 32

Include CoreAudio at the line 35 in pjmedia/src/pjmedia-audiodev/coreaudio_dev.c:

Index: pjmedia/src/pjmedia-audiodev/coreaudio_dev.c
===================================================================
--- pjmedia/src/pjmedia-audiodev/coreaudio_dev.c	(revision 4580)
+++ pjmedia/src/pjmedia-audiodev/coreaudio_dev.c	(working copy)
@@ -32,6 +32,7 @@

 #include <AudioUnit/AudioUnit.h>
 #include <AudioToolbox/AudioConverter.h>
+#include <CoreAudio/CoreAudio.h>
 #if !COREAUDIO_MAC
    #include <AudioToolbox/AudioServices.h>

Add static at the line 286 in third_party/srtp/crypto/cipher/aes_icm.c:

Index: third_party/srtp/crypto/cipher/aes_icm.c
===================================================================
--- third_party/srtp/crypto/cipher/aes_icm.c	(revision 4580)
+++ third_party/srtp/crypto/cipher/aes_icm.c	(working copy)
@@ -283,7 +283,7 @@
  * this is an internal, hopefully inlined function
  */

-inline void
+static inline void
 aes_icm_advance_ismacryp(aes_icm_ctx_t *c, uint8_t forIsmacryp) {
   /* fill buffer with new keystream */
   v128_copy(&c->keystream_buffer, &c->counter);

Add static at the line 127 in third_party/srtp/crypto/math/datatypes.c:

Index: third_party/srtp/crypto/math/datatypes.c
===================================================================
--- third_party/srtp/crypto/math/datatypes.c	(revision 4641)
+++ third_party/srtp/crypto/math/datatypes.c	(working copy)
@@ -124,7 +124,7 @@
   return bit_string;
 }

-inline int
+static inline int
 hex_char_to_nibble(uint8_t c) {
   switch(c) {
   case ('0'): return 0x0;

Configure and build pjsip:

$ CFLAGS="-mmacosx-version-min=10.8" ./configure
$ make

Build Telephone.

Coding Style

Telephone source code follows Google Objective-C Style Guide with the exception of maximum 120-column width and 4 spaces for indentation.