Sunil, I can think of following options if you dont want IPMA..
1. Configure a shared line ( with privacy feature ) among Manager & Sec's phone line. If mgr doesnt pickup, sec will.
2. Use Call Pickup feature by adding these 2 phones in one pickup group. But here the sec shd be able to see/hear the mgr's phone ringing, so that she picks it up if mgr is away from desk etc.
3. Mgr's phone can be fwded to sec's phone using CFNA setting equivalent to 3 ring duration. So that if mgr doesnt answer call for 3 rings, call gets diverted to sec's phone.
Please refere CUCM Feature & Services guide for these.
GP.
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