[Users] SER vs openSER

Hi all, I am a SER/openSER newbie and was looking at an option of using these SIP stacks. Anyone having any doc/link that compares these two SIP servers. The major criteria that we are looking for are: - Simplicity of using the SIP stack (Most IMP) - Perfomance - Support for Presence Any pointers in this direction will be highly appreciated. Thanks, Pankaj The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com