Sangoma SS7 - Controlling NADI values

Definition:

The NADI or NAI (Nature of Address Indicator) is used to determine the scope of the address value for routing purposes.

 

Standard:

Called NADI - ITU Q.764 Section 3.9 b)

Calling NADI - ITU Q.764 Section 3.10 b)

RDNIS NADI - ITU Q.763 Section 3.44

Usage:

The format of the NADI field: <nadi value>

The NADI values can be set 2 ways:  via the dial plan for per-call manipulation or by hard-coding them per ISUP interface.

When setting the value via the dial plan:

<action application="export" data="freetdm_ss7_cld_nadi=<nadi value>"/>

<action application="export" data="freetdm_ss7_clg_nadi=<nadi value>"/>

<action application="export" data="freetdm_ss7_rdnis_nadi=<nadi value>"/>

When setting the value via the ISUP interface configuration:

<param name=cld_nadi" value="<nadi value>"/>

<param name=clg_nadi" value="<nadi value>"/>

<param name=rdnis_nadi" value="<nadi value>"/>

Currently the following values are accepted for the NADI value:

Value	Calling	Called
0	spare	spare
1	subscriber number	subscriber number
2	unknown	unknown
3	national	national
4	international	international

 

Example:

FreeSWITCH (configuration):

<isup_interface name="interface1">

<param name="spc" value="131"/>

<param name="mtp_route" value="route1"/>

<param name="ssf" value="nat"/>

<param name="license" value="/etc/wanpipe/site1.txt" />

<param name="clg_nadi" value="4"/>

<param name="cld_nadi" value="4"/>

<param name="rdnis_nadi" value="4"/>

</isup_interface>

 

FreeSWITCH (setting):

<action application="set" data="clg_nadi=3"/>  <!-- set the calling number nadi to national-->

<action application="set" data="cld_nadi=4"/> <!-- set the called number nadi to international -->

<action application="export" data="freetdm_ss7_clg_nadi=${clg_nadi}"/> <!-- export the private variables to the proper FreeTDM named variable -->

<action application="export" data="freetdm_ss7_cld_nadi=${cld_nadi}"/> <!-- export the private variables to the proper FreeTDM named variable -->

               <action application="export" data="freetdm_ss7_rdnis_nadi=${rdnis_nadi}"/> <!-- 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 -->

 

FreeSWITCH (receiving):

<action application="log" data="INFO The incoming called number has a NADI=[${freetdm_ss7_cld_nadi}]"/>

<action application="log" data="INFO The incoming calling number has a NADI=[${freetdm_ss7_clg_nadi}]"/>

<action application="log" data="INFO The incoming RDNIS number has a NADI=[${freetdm_ss7_rdnis_nadi}]"/>

 

Asterisk (via NSG) (setting):

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

exten => _X., n, SIPAddHeader(X-freetdm-cld-nadi: 4)

exten => _X., n, SIPAddHeader(X-freetdm-clg-nadi: 3)

exten => _X., n, SIPAddHeader(X-freetdm-RDNIS-NADI: 3)

exten => _X., n, dial(sip/${EXTEN}-g=g1-h=a@nsg)

 

Asterisk (via NSG) (receiving)

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

exten => _X., n, noop(The incoming called number has a NADI=${SIP_HEADER(X-freetdm-cld-nadi)})

exten => _X., n, noop(The incoming calling number has a NADI=${SIP_HEADER(X-freetdm-clg-nadi)})

exten => _X., n, noop(The incoming RDNIS number has a NADI=${SIP_HEADER(X-freetdm-rdnis-nadi)})

 

---

Generic Number

The following variables can be used to set/receive parameters within the Generic Number IE (Section 3.26 of ITU Q.763)

Variable	Description
freetdm_ss7_gn_digits	Digits
freetdm_ss7_gn_numqual	Number Qualifier
freetdm_ss7_gn_nadi	Nature of Address Indicator
freetdm_ss7_gn_screen_ind	Screening Indicator
freetdm_ss7_gn_pres_ind	Presentation Indicator
freetdm_ss7_gn_npi	Numbering Plan Indicator
freetdm_ss7_gn_num_inc_ind	Number Incomplete Indicator

 

 Freeswitch Receiving:

 <action application="log" data="INFO The incoming generic number is=[${freetdm_ss7_gn_digits}]"/>
 <action application="log" data="INFO The incoming generic number has a NADI=[${freetdm_ss7_gn_nadi}]"/>

 

Freeswitch Transmitting:

<action application="bridge"
data="{freetdm_ss7_gn_digits=12345, freetdm_ss7_gn_numqual=6, freetdm_ss7_gn_nadi=3, freetdm_ss7_gn_screen_ind=3,
   freetdm_ss7_gn_pres_ind=0, freetdm_ss7_gn_npi=1, freetdm_ss7_gn_num_inc_ind=1} freetdm/g1/a/${destination_number}/>