How to compile PJSIP for iPhone OS
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First, download iPhone SDK from http://developer.apple.com/login (requires login).
In the example below, we are using version 3.1.2. Next, follow these steps:

1. Apply the patch configure-diff.txt

2. Create pjlib/include/pj/config_site.h
/* Disable floating point support */
#undef PJ_HAS_FLOATING_POINT
#define PJ_HAS_FLOATING_POINT   0

/* Select codecs to disable */
#define PJMEDIA_HAS_ILBC_CODEC       0
#define PJMEDIA_HAS_SPEEX_CODEC 0

/* For CPU reason, disable speex AEC. */
#define PJMEDIA_HAS_SPEEX_AEC 0

#define PJMEDIA_AUDIO_DEV_HAS_PORTAUDIO 0

#define COREAUDIO_MAC 0

3. Define environment variables
export DEV=/Developer/Platforms/iPhoneOS.platform/Developer
export SDK=${DEV}/SDKs/iPhoneOS3.1.2.sdk
export PATH=${DEV}/usr/bin:${PATH}
export CFLAGS="-O2 -arch armv6 -isysroot ${SDK}"
export LDFLAGS="-O2 -arch armv6 -isysroot ${SDK}"
export CPP="${DEV}/usr/bin/cpp"

4. Create symbolic links to arm compiler
cd ${DEV}/usr/bin
ln -s arm-apple-darwin9-gcc-4.0.1 arm-apple-darwin9-gcc
ln -s arm-apple-darwin9-g++-4.0.1 arm-apple-darwin9-g++
ln -s ranlib arm-apple-darwin9-ranlib

5. autoconf aconfigure.ac > aconfigure

6. ./aconfigure --host=arm-apple-darwin9

7. Create user.mak
export LDFLAGS += -framework AudioToolbox -framework Foundation

8. make dep and make
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How to develop iPhone apps
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1. Go to iPhone Provisioning Portal
http://developer.apple.com/iphone/my/overview/index.action

2. Follow the steps and how-tos to create a provisioning profile (i.e. Certificates, Devices, App IDs, Provisioning).

3. Open XCode, change XCode-Preferences-Indentation-Tab Width 8.

4. Open an iPhone app (ipjsystest or ipjsua) located in pjsip-apps/src using XCode.

5. Change Base SDKs for All Configurations in Project-Edit Project Settings (according to the iPhone's OS version).

6. Edit Resources-Info.plist-Bundle identifier, change it according to your provisioning profile.

7. Connect the iPhone via USB, then click Build and Run.