Support for Cisco Jabber

Cisco Unified CME 8.6 and later versions support Cisco Jabber. The  softphone SIP client is an iPhone application and works as a SIP  softphone. The SIP softphone client is capable of supporting VoIP over  WLAN. Cisco Unified CME 8.6 supports supplementary services such as  Hold, Resume, Transfer, Call Park, and Call Pickup for the softphone SIP  client.

Note

Shared line, conference, and hand-off call to GSM  are not supported.

HTH

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That is supported in CME 9.0

That means you will need and ISR G2 to use the features. It will never work on an ISR G1 router.