NAT and Bridged required.

Debian 12 Install

Setup with opensource only switch. Much better!

# Copy down private key, store and set security on it
cd keys
sudo chmod 60 ssh-key-2025-07-11.key

# ssh on to cloud instance
sudo ssh -i ./keys/ssh-key-2025-07-18.key ubuntu@79.72.86.71
sudo apt update
sudo apt full-upgrade

sudo apt install nano
sudo apt install cron
sudo systemctl start cron
sudo systemctl enable cron
sudo apt install ufw

https://www.atlantic.net/vps-hosting/how-to-install-asterisk-and-freepbx-on-ubuntu/

after ./install -n messages about SIP missing fwconsole ma install pm2 Rerun ./install -n

Update firewall rules 80 Web Dashboard

Stateless connection needed for 80? - sudo iptables -I INPUT -p tcp -m tcp –dport 80 -j ACCEPT did not work.

sudo iptables -S

sudo iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT
sudo netfilter-persistent save

This gets the web server visible

FreePBX Config

Load User and other modules - Admin, Check Online, Select then process.

Unlock sudo fwconsole unlock s231lcov0fbdsnhaiidchantu4 (highlighted PHP session text)

Update firewall rules 42002 SIP - UDP and 80 Web Dashboard sudo iptables -I INPUT 6 -m state –state NEW -p tcp –dport 80 -j ACCEPT sudo iptables -I INPUT 6 -m state –state NEW -p udp –dport 42002 -j ACCEPT

Check firewall rules

Revised to install UFW, use this instead of directly changing iptables

sudo ufw status
sudo ufw allow http
sudo ufw allow 5060:5061/udp
sudo ufw allow 10000:20000/udp

User Ext Setup

https://hamsoverip.github.io/wiki/endpoints/hard_phones/cisco504g/

Manual provisioning following sign up email

Check in Advanced for HOIP EXT that SIP is over UDP

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/csbpipp/ip_phones/user/guide/50X_sip_user_guide_source/500_SIP_user.pdf

https://software.cisco.com/download/home/282724650/type/282582477/release/7.5.6

Virtual box windows instance in network bridge mode then on same network as SPA. 7.5.2b then 7.6.2 then 7.6.2SR6 Using the firmware updater from each release. SR7 did not have a firmware updater.

TCP must be enabled. PBX on different IP so can use default port. Ext 2 tab - line enable AND Phone tab - Line key 2 enabled.

The picture need to be of a specific size. If size is not correct, it will not show up on your phone. 128 x 48 pixels and 1-bit Deep Convert any picture to this size using any graphic editing tool, then upload to a web server and use it's URL to set-up the picture on your SPA 504G.

https://wiki.hamshackhotline.com/doku.php?id=tt:tips.and.tricks:spare.line.key.functions

http://192.168.0.126/admin/reboot

This might be the only (roundabout) way to get web interaction on the 504G. From a Programmable Soft Key - Call a URL to perform a task, that returns an XML result. No support of HTML or RSS on the 504 phone.

The PHP example on this link is confusing/missing.

https://community.cisco.com/t5/voice-systems-and-accessories-small-business/programmable-soft-key-help-how-to-solved-answered/m-p/3274669

Setup on spare ext 4 button

fnc=xml;url=http://192.168.0.186/test.php;nme=TeaPlease!

PHP script

<?php
header('Content-Type: application/xml');
echo '<CiscoIPPhoneText>';
echo '<Title>Tea Status</Title>';
echo '<Prompt>Thanks!</Prompt>';
echo '<Text>Your Tea Request Was Successful!</Text>';
echo '</CiscoIPPhoneText>';
?>

Key thing is only Cisco “SPA50x” XML objects can be used for the reply.

The URL can be called directly - as above, or an XML file can be used to define the URL and handling of response.

The best “Doc” found so far. Obviously only a few of these XML objects apply to the older SPA50x.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/all_models/xsi/9-1-1/CUIP_BK_P82B3B16_00_phones-services-application-development-notes/CUIP_BK_P82B3B16_00_phones-services-application-development-notes_appendix_01011.html

SPA504G Configuration Utility

Voice, System, Optional Network Configuration

Syslog Server

sudo nano /etc/rsyslog.conf‎
include UDP/TCP
sudo service rsyslog restart
sudo tail -f /var/log/syslog

TBA

https://freestar.network/connect/

Via HamShackHotline 94107

SPA504G Configuration Utility

Advanced, Voice ,Text Message From 3rd Party: No, Text Message: No, No Text Alert: Yes, Submit all changes

*99 to key up and # to drop the key

https://help.webex.com/en-us/article/ny1ibtz/Programmable-softkeys-configuration

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/csbpipp/ip_phones/administration/guide/frame_source/500-series-7-5-7/ip_phone_admin/LEDs.html

SPA504G Configuration Utility

Admin,Advanced,Voice,Phone

Switch off Line 1 LED

c=o