Knowledgebase: Unified Communications > SmartNode
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How to solve the problem '400 From_tag is required'
Posted by Elena Brambilla, Last modified by Daniel Lizaola on 12 December 2017 04:45 PM
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If the SIP-server sends back "400 From_tag is required" most likely the problem are missing "<>" - brackets around the FROM - header. By default SmartNode does not use those brackets and the FROM-header looks like this: From: sip:123@a.b.c.d:5060;tag=XYZ However there is a way how to add them. The solution is to add a calling-name in order to add those brackets. Below you will find an example of how to create such a mapping-table: mapping-table calling-e164 to calling-name MAP_CALLING_NAME map (.%) to \1 Be aware you will need to use the mapping-table within a routing-table. You will have such a routing-table already in your configuration right before you route the calls to the sip-interface. All you need to do to use the mapping-table is use it as a function like this: routing-table called-e164 RT_TOWARDS_SIP route .T dest-interface IF_SIP MAP_CALLING_NAME This will add the angle brackets around the from-header. | |
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