Sangoma SS7 - Setting Sub-Address

Definition:

The Sub-address supplementary service allows the called (served) user to expand his addressing capacity beyond the one given by the ISDN number - ITU Q.738.1 Section 8.1

 

Standard:

ITU Q.731.8 Sub-Addressing (SUB)

 

Usage:

The format of the sub-address field is: <type of encoding digit><sub-address>

Currently the following values are accepted for the type of encoding:

Type of Encoding	Description
0	encoding type is NSAP using IA5 values for the digits.  Only numberic characters are allowed (0-9).
1	national variant using 4-bit hex value encoding.  Only hex characters are allowed( 0-9,a,b,c,d,e,f)

 

Example:

 

FreeSWITCH:

<action application="set" data="clg_sub_addr=05551234"/>  <!-- set the calling sub-address (555-1234) using NSAP encoding to a local variable -->

<action application="set" data="cld_sub_addr=15556789F12"/> <!-- set the called sub-address  (555-6789-FF-12) using national encoding to a local variable -->

<action application="export" data="freetdm_ss7_clg_subaddr=${clg_sub_addr}"/> <!-- export the private variables to the proper FreeTDM named variable -->

<action application="export" data="freetdm_ss7_cld_subaddr=${cld_sub_addr}"/> <!-- export the private variables to the proper FreeTDM named variable -->

<action application="bridge" data="freetdm/g1/a/${destination_number}/> <!-- dial out on group 1 using ascending hunting -->

 

Asterisk via NSG:

NOTE: SIP X-HEADER support needs to be enabled in freetdm.conf.xml

exten => _X., n, SIPAddHeader(X-Freetdm-clg-subaddr: 05551234) ;set the SIP X-header for calling sub-address (555-1234) using NSAP encoding

exten => _X., n, SIPAddHeader(X-Freetdm-cld-subaddr: 15556789F12) ;set the SIP X-header for called sub-address (555-6789-FF-12) using national encoding

exten => _X., n, dial(sip/${EXTEN}-g=g1-h=a@nsg) ; dial out sip profile NSGon group 1 using ascending hunting

 

FreeSWITCH via NSG:

NOTE: SIP X-HEADER support needs to be enabled in freetdm.conf.xml

<action application="set" data="sip_h_X-clg-sudaddr=05551234"/>

<action application="set" data="sip_h_X-cld-sudaddr=15556789F12"/>

<action application="bridge" ...