Best CRM with Dialer Integration for Managing Multi-Client Outbound SDR Campaigns

Hey all, Quick CRM question for outbound agencies. We have GTM engineers building cold email and LinkedIn campaigns, and SDRs calling warm replies, follow ups and cold lists for multiple clients. I'd say that our work is about 50/50 from cold email and cold calling. One SDR may work across 3 clients in a day. Main goal is to not lose replies. For example, when someone replies in Smartlead with “can you call me?”, it should become an SDR task with client, campaign, context and phone number. Any recommendations for a good CRM with solid dialer or power dialer integrations?