Pi PICOW Basic VOIP/SIP telephone
A simple VOIP/SIP portable WiFi telephone handset, running off a PIPICOW using the PI PICOW WiFi for connectivity.
Built to be as basic as possibe, but to have working "usable" hand held phone.
Features, SD card, WiFi, Microphone Via A2d, Speaker Via PWM, LiPo battery with charging from USB, 15 key keyboard and a SSD1306 I2C OLED display. Also has connector for external signals to trigger dial, answer and indications of ringing. PCB to be available via http://www.extkits.co.uk
9 xWiFi accesspoint credentials and 9 SIP server details can be stored in the config on the SD card and an auto dial number.
Tested with Asterisk Asterisk 18.21.0
Very much in its infancy (see todo)
Test compatability with other servers, Intermittant no speach, Cant Cancel out going call befre answer , connect gpio interface for dial, answer and indications of ringing, Improve display, Lockup after calls, requires reboot to make second call, NAT Calling issues, various and ubiquitous, Voice quality improvements, Volume up/down mike, Volume up/down speaker, Set Caller ID.
Secure, Encrypted or working...
Totally not suitable for any purpose ... yet....
