Configuring SIP-ISUP Reason Header IWF

To use this feature, enable the add-reason-header parameter in the sip-config.

To enable SIP-ISUP reason header interworking:

In Superuser mode, type configure terminal and press Enter.
```
ORACLE# configure terminal
ORACLE(configure)#
```

Type session-router and press Enter.

ORACLE(configure)# session-router
ORACLE(session-router)#

Type sip-config and press Enter.

ORACLE(session-router)# sip-config
ORACLE(sip-config)#

add-reason-header—Enable this parameter to perform reason header interworking during native SIP-ISUP interworking. The default is disabled.
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