Trunking off a switch that is connected as a vPC peer

Hello,
Yesterday I ran into an issue in someones environment where they wanted to trunk a 2960 switch (Lets call it SwitchA) off of another 2960 (SwitchB) switch which was a vPC peer to a set of Nexus 5k's. When he did this, he noticed his phones were unable to communicate with the voice gateway. The same VLANs were allowed across the trunk from SwitchA to SwitchB and to the Nexus5K
When I moved SwitchA to its own port channel and vPC the voice traffic was able to communicate just fine. I am more concerned about this issue for learning/experience purposes. Has anyone run into a similar issue or know of a vPC rule that is preventing SwitchA from hanging off SwitchB? I have never seen a setup where someone wanted to do that when using vPC's but am still curious about that setup incase I run into it again in the future.
Thanks,

Hey Madhu,
Thanks for your reply. 
Yes, I was allowing the same VLAN over the peer-link also. If I wasnt then all the other IDF switches would of had downed phones. The odd thing also is when SwitchA was trunked to SwitchB desktops had connectivity but phones didnt. I then SSH'd into SwitchA and tried pinging the gateway for VLAN 120 (Voice VLAN) and was able to hit the gateway and the phone system, showing I had connectivity. For some reason though, the handsets just werent finding the router.

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