As far my understanding the IOS version is more considered only for the SIP dialers not for SCCP. The reason why i am telling is the way how the SIP dialer and SCCP dialer communicates to the Voice Gateway.
The SIP Dialer process has communication sessions with Voice Gateways,Outbound Option Campaign Manager, CTI Server, and MR PIM.
The SCCP Dialer process has communication sessions with Unified CM, Outbound Option Campaign Manager, CTI Server, and MR PIM.
As per BOM "Outbound Option SIP dialer is compatible only with IOS Release 15.2(3)T."
i agree with Senthil.. the IOS is more for the SIP dialer as well as for the CVP.. for IPIVR and SCCP, i think there were no restrictions as call goes/comes from CUCM.. so as long as IOS is supported by CUCM (which i think is the case for all IOS versions) it should be fine... take whatever is supported by CVP and SIP dialer
Outbound Option SIP Dialer: Supports 28xx, 3845, AS5350xm, and AS5400xm gateways with a PVDM2 DSP card Supports ISR G2 gateways (29xx and 39xx) with PVDM3 DSP card When needed for design, requires Cisco Unified SIP Proxy Version 8.5(1) or later Supports IOS Release 15.2(3)T, and 15.2(4)M, 15.2(4)M2. CUBE can be used as a SIP proxy for the SIP dialer with CCE 9.0(4) and later. However, CUBE is allowed between the Gateways and rest of UCCE/ICM solution only when implementing MediaSense. Please reference the MediaSense SRND for full implementation details.
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