100rel retransmit timer

gangban.lau@xxxxxxxxx (Gang Liu) · Tue, 5 May 2009 18:43:14 +0800

hi benny,
    below SIP flow will crash pjsip-ua api.

UAC --> INVITE --> UAS     # UAC support 100rel and UAS required
    <-- 100    <--
    <-- 180    <--  # require 100rel
    --> CANCEL -->

    <-- 200    <--

    <-- 487    <--
    --> PRACK  -->
    <-- 500    <--

    --> ACK    -->
    # crash  here because inv tsx was destroyed but 100rel retransmit timer
still there

It is better to use pjsip_100rel_tx_response() to send out 487 other than
pjsip_dlg_send_response() at inv_respond_incoming_cancel().

regards,
Gang
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