Need an HMR to delete a parameter in the Invite message

Can you help me with an HMR to delete the very last parameter starting with a: *... in the below invite message.

INVITE sip:+918035778017@192.168.104.101:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.104.9:5060;branch=z9hG4bKjoc3ot004ohlc5bhhvg0.1
Max-Forwards: 66
From: <sip:+919779933350@192.168.104.9>;tag=1c1180056693;user=phone
To: <sip:+918035778017@192.168.104.101>
Call-ID: 10899587651622023104524@100.64.24.4
CSeq: 1 INVITE
Contact: <sip:192.168.104.9:5060;transport=udp>
Supported: 100rel,replaces,path,resource-priority,sdp-anat
Allow: INVITE,BYE,REGISTER,ACK,OPTIONS,CANCEL,SUBSCRIBE,NOTIFY,PRACK,INFO,REFER,UPDATE,PUBLISH,MESSAGE
Expires: 180
Session-Expires: 5400
Min-SE: 90
User-Agent: BGLRUPKWCHPNBC11AC/v.7.40A.250.366
Privacy: none
Content-Type: application/sdp
Content-Length: 372
d: no-fork
a: *;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel"  Need to delete this using HMR