Since 0.5.12, Siproxd includes a Quick-Dial feature. This allows you to define SIP numbers that can be accessed by using a shortctu (like "*nn") from any local SIP phone.
For example, the following lines in your siproxd.conf will configure 2 Quick-Dial numbers:
# *01 sipphone echo test pi_shortdial_entry = 17474743246 # *02 sipphone welcome message pi_shortdial_entry = 17474745000
The numbering starts with "1" ("*01") and every following "pi_shortdial_entry" entry will allocate the following position. Curently it is not possible to freely assign the positions.