How to determine MO and MT call in SIP Networks

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Hi all,

I am developing a SIPB2B which acts as a session controller.
No registration mechanism is implemented in it.
It will directly receives Invite from UAC and forwards it to UAS after
successful billing authentication.

Can any one help me, how could I distinguish between MO and MT calls (In
pure SIP networks).
Is there any SIP header to determine the call type.

Thanks,
Kiran.

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Hi all,<br><br>I am developing a SIPB2B which acts as a session controller.=
<br>No registration mechanism is implemented in it. <br>It will directly re=
ceives Invite from UAC and forwards it to UAS after successful billing auth=
entication.<br>

<br>Can any one help me, how could I distinguish between MO and MT calls (I=
n pure SIP networks). <br>Is there any SIP header to determine the call typ=
e.<br><br>Thanks,<br>Kiran.<br><div style=3D"visibility: hidden; left: -500=
0px; position: absolute; z-index: 9999; padding: 0px; margin-left: 0px; mar=
gin-top: 0px; overflow: hidden; word-wrap: break-word; color: black; font-s=
ize: 10px; text-align: left; line-height: 130%;" id=3D"avg_ls_inline_popup"=
>

</div>

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