Src: https://www.tm.com.my/Office/Business/SME/Solutions/Pages/Multi-Line-SIP.aspx Happy to say that we’ve successfully set up Asterisk 11 or higher with TM’s Multi-Line SIP which basically uses IMS signaling on Huawei devices used by Telekom Malaysia. We had to modify chan_sip.c and parser  files to support TEL: URI for INVITE messages. … “Telekom Malaysia (TM) Multi-Line SIP setup with vanilla Asterisk or FreePBX over TEL URI”

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