Howto? Anonymous outgoing SIP call [[email protected]]

Unanswered Question
Aug 27th, 2010


we are currently in the process to get our UC540 certified by a swiss cable SIP provider, the final test we need to pass is the anonymous outgoing call (hiding caller id) which is initiated by sending [email protected] in the SIP Invite-URI (see

From: "Anonymous" <sip:[email protected]>;tag=1928301774

Now our questions:

- How can we set this (CLI preferred) permanently for a single extension

- Is it possible to do this case-by-case using a SPA525G phone?

Any help on this would be greatly appreciated, thank you!

I have this problem too.
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antyeung Fri, 08/27/2010 - 10:11

Can you try configuring the following-

voice service voip
   privacy header



webmasterware Mon, 08/30/2010 - 05:10

Hi Anthony,

thanks a lot, this works as global setting.

Final question regarding this: Is it possible to configure this

- for single extentsions only

- case-by-case (e.g. by dialing some code before the number like *31# for example on european ISDN)

Best regards

antyeung Mon, 08/30/2010 - 08:27

You can try using sip profiles at the dial peer level-

voice class sip-profiles 1
request ANY sip-header From modify "From: .*>" "From: \"Anonymous\" "

dial-peer voice 1 voip
  voice-class sip profiles 1

And then create a destination pattern to match your specific star code or use cor-lists to restrict who can use that dial peer.

I didn't test this in the lab so you may need to tweak this to suit your needs. But hopefully this should give you some ideas.



Purna Wijenayaka Mon, 04/22/2013 - 07:43

Hi ,

we are receiving this

Anonymous" ;

can we write a SIP manipulation rule to change this as follows ?

117416000 " ;

please advice

ausjustin Sun, 10/25/2015 - 21:17

Hi Purna 


have you fixed this yet ? i am looking for same solution .