I was trying to setup a call flow according to 3rd party call control model flow 1 (RFC 3725 - Figure 1) using Cisco 7960 phones. In this model, user A (which received an INVITE with no SDP) receives SDP description in the ACK. In the Cisco phones, I noticed that as soon as it received an ACK containing SDP, it sent a BYE.
Has anyone else noticed this behaviour ?
I am using Cisco 7960 SIP phone with firmware version 7.2 (Application load ID: POS3-07-2-00).
Thanks,
Anshuman
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