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-2025-07-19.key

# ssh on to cloud instance
sudo ssh -i ./keys/ssh-key-2025-07-19.key ubuntu@xx.xx.xx.xx
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
sudo apt install net-tools

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

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

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

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

if you need to Unlock the admin page sudo fwconsole unlock s231lcov0fbdsnhaiidchantu4 (highlighted PHP session text)

User Ext Setup

Had to change SIP port directly in asterisk - FreePBX ad restart did not work sudo nano /etc/asterisk/sip_general_additional.conf

Revise sudo nano /etc/php/*/apache2/php.ini ; Maximum amount of memory a script may consume ; https://php.net/memory-limit memory_limit = 256M

SIP TCP Port Min: 560 - 580 updated 5081

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.

UDP 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 https://hamsoverip.github.io/wiki/endpoints/hard_phones/cisco504g/#make-a-test-call

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