What is the reason for such response?
SIP/2.0 491 Request Pending
Via: SIP/2.0/UDP
192.168.129.74
:5160;branch=z9hG4bK17c3.17db29e7.0;received=192.168.129.74
Via: SIP/2.0/UDP 192.168.129.74 ;branch=z9hG4bK17c3.23083974.0
Via: SIP/2.0/UDP 192.168.129.74:5070;branch=z9hG4bK5b33ae78;rport=5070
From: "IPFon" <sip:[EMAIL PROTECTED]:5070>;tag=as7217acbc
To: <sip:[EMAIL PROTECTED]>;tag=as7217acbc
Call-ID: [EMAIL PROTECTED]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Length: 0
X-Asterisk-HangupCause: Normal Clearing
X-Asterisk-HangupCauseCode: 16
Asterisk will send a 491 Request Pending when it is currently
processing an INIVTE on a particular call and it gets another INVITE
that isn't a retransmission.
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