FAQ/How to display a text message to the phone in order to appear on the display

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Text messages (desktop messages) to the idle screen of the snom3xx/7xx/8xx phones, follow these steps:

1) Configure these settings on the phone┬┤s web interface

Support broken Registrar to "on"
Filter Packets from Registrar to "off"
Network identity (port): 5060
Clear Desktop Message on Cancel --> "off" -> message stays permanently --> "on" -> message can be deleted via "Cancel" key

2) Re-boot (!!) the phone but do NOT reset it!

3) Set up at least one identity (e.g. 486@mypbx) on the phone and select it as outgoing identity.

4) Install SIPSAK on any computer in your network (Linux/ Windows versions available) and enter the following command:

sipsak -i -M -B "Test" -s sip:493@phoneIP

5) Result: The message "Test" will be displayed depending on the phone type:

  • snom870: The text message will be shown on the display; see the screenshot below:
  • snom820: line above the softkey icons (won't overwrite them); see the screenshot below:.
  • snom370: line above the softkey icons; see the screenshot below:
  • snom360: line above the softkey icons; see the screenshot below:
  • snom320: 1st line between date and time; see the screenshot below:
  • snom300: 2nd line


  • See the SIP trace in order to check if the SIP message has reached the phone e.g.:
MESSAGE sip:493@phoneIP:5060;...
  • The message is sent to a specific identity on the phone, e.g., sip:493@phoneIP therefore the phone must be set to that identity before (!!) --> The message can be matched then and the phone answers "200 OK" otherwise "404 Not Found"

Note: Starting from firmware V6, it is also possible to show special messages for a particular call as long as the Call-Id matches the current call. An example of that MESSAGE method would be:

MESSAGE sip:153@ SIP/2.0

Example of SIP flow


Received from udp: at 23/10/2009 17:37:35:305 (334 bytes):

MESSAGE sip:440@ SIP/2.0
Via: SIP/2.0/UDP;branch=z9hG4bK.6595ca81;rport;alias
To: sip:440@
Call-ID: 868689509@
Content-Type: text/plain
Max-Forwards: 70
User-Agent: sipsak 0.9.5
From: sip:sipsak@;tag=33c72665
Content-Length: 20



Sent to udp: at 23/10/2009 17:37:35:311 (228 bytes):

SIP/2.0 200 Ok
Via: SIP/2.0/UDP;branch=z9hG4bK.6595ca81;rport=4325;alias
From: sip:sipsak@;tag=33c72665
To: sip:440@
Call-ID: 868689509@
Content-Length: 0



This feature is fully implemented in the snom ONE telephone system. See the snom ONE user manual here: http://downloads.snom.net/snomONE/docs/snomONE_online_book.pdf (search for Instant Message)

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