I need a light weight open source sip outbound proxy installation on a Linux server to route sip traffic for Acrobit SIP Mobile App. It must be configured to support inphonex VoIP provider. It must support Acrobits Mobile client. Must support of clients behind NAT and be compatible with ALG-enabled routers.
Please have experience in sip outbound proxy. Here is a list of some available open source sip proxy: