Overview

SIP-I (SIP with encapsulated ISUP) is an ITU-defined SIP extension which allows IP networks to provide services that are supported by ISUP networks. SIP-I specifies the criteria for enabling ISUP internetwork with SIP networks. SIP-I is an extension to an existing SIP protocol and transports ISUP specific messages over a SIP network. 

SN10k support

SN10k supports Profile C (SIP-I) of ITU Q.1912.5. Effective standard guidelines can be found in table C.1.1.2 "SIP/SIP-I Signalling Profiles" of this ITU-T PDF file.

Following features aren't currently available in the SN10k SIP-I implementation:

• Precondition (RFC3312)
• Reception of INVITE without SDP
• SIP-I digit overlap
• SUS/RES ISUP message to SIP INFO message

ISUP variants supported by SN10k SIP-I implementation

• ANSI-88
• ANSI-92
• ANSI-95
• TELCORDIA
• ITU
• ITU97
• SINGAPORE
• Q767
• NTT
• CHINA
• ETSI
• ETSIV3
• UK
• SPIROU

SIP-I is supported from SmartMedia 2.6.23 release onwards.

SIP-I configuration

Enabling the SIP-I feature is done per SIP NAP basis. Please navigate to 'Menu -> NAPs' and select the desired SIP NAP. Then in the 'SIP-I Parameters' section of NAP configuration check the 'Enable' directive and select a suitable 'ISUP Protocol Variant'.

Example configuration screenshot