[OpenSIPS-Users] Incorrect ACK

[goup2010]

Hello,

The OpenSIpS send follow ACK. Is this correct? Why information in FROM and
TO is duplicated?

ACK sip:55667715488 at ITSP_IP;user=phone SIP/2.0
Via: SIP/2.0/UDP Opensip_IP;branch=z9hG4bK7378.80cad8d7.3
Via: SIP/2.0/UDP User_IP:2000;branch=z9hG4bK58b4d72c
Max-Forwards: 69
From: "15489" <sip:15489 at Opensip_IP;user=phone sip:15489 at Opensip_IP;user=phone
>;tag=as19ccd188
To: <sip:55667715488 at ITSP_IP:5060;user=phone
sip:55667715488 at ITSP_IP:5060;user=phone
>;tag=ff0e2300ffff0510ff0000065b647818
Contact: <sip:15489 at User_IP:2000>
Call-ID: 417605da6668b609461878236bdd3ca0 at User_IP:2000
CSeq: 102 ACK
User-Agent: SBC
Content-Length: 0
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