Matt Furstenburg

Tight end Matt Furstenburg is one of several undrafted rookie free agents hoping to make the Ravens' final roster. (Karl Merton Ferron / Baltimore Sun / August 15, 2013)

As the final round of the 2013 draft began in April and Matt Furstenburg agonized over where his NFL career would begin, the former Maryland tight end got a phone call that eased some of his anxiety.

So many people — from friends and former teammates to potential future employers — had already contacted him, but the voice on the other end made this call unique.

"John Harbaugh called me and said, 'We have to take a cornerback [here], but we want you," recalled Furstenburg, a three-year starter for the Terps who was one of eight undrafted free agents that survived Sunday's roster cuts. The Ravens currently have 77 players on their roster and they’ll need to get down to 75 on Tuesday and be at 53 on Aug. 31. "That was awesome. He was the only head coach that called."

Like the other undrafted free agents in camp, Furstenburg is bidding to survive Tuesday's roster cut and get one step closer to the Ravens' 53-man roster.

The Ravens' front office has earned plenty of praise for its decisions during the draft, but it is also in the minutes after the final pick has been made, a period that assistant general manager Eric DeCosta equated to a "feeding frenzy," when the organization has historically done some of its best work.

Few organizations have unearthed as many impact undrafted free agents as the Ravens have, and team officials take the process so seriously that they guard their recruiting methods almost as aggressively as their weekly game plans.

"I don't want to compare it to Coke's secret recipe, but we compare it to Coke's secret recipe," DeCosta said. "We try to treat the process as one of the most competitive things that we do all year. Besides the games [themselves], undrafted free agency is when you're competing against the other 31 teams for a very small amount of players with a very small amount of money. … For us, it's critically important."

Just how important?

Scan a box score from the Ravens' 34-31 victory over the San Francisco 49ers in Super Bowl XLVII. Kicker Justin Tucker made both of his field-goal attempts, all four of his extra points and booted four touchbacks. Dannell Ellerbe started at weak-side linebacker and had a team-leading nine tackles and a crucial quarterback pressure on Colin Kaepernick's final incompletion of the Ravens' decisive goal-line stand. Ma'ake Kemoeatu started at nose tackle while Albert McClellan and Josh Bynes played key roles on special teams. It was Bynes' tackle of returner Ted Ginn Jr. as time expired that secured the franchise's second Super Bowl title.

All five of those players initially signed with the Ravens as undrafted free agents, persevered through long odds to make the roster and eventually became key contributors. It's a familiar storyline for the Ravens, who have seen some of their college free agents go on to make Pro Bowls (Priest Holmes and Bart Scott) or become postseason heroes (Tucker and Ellerbe). Others, like center Mike Flynn, inside linebacker Jameel McClain and safety Will Demps, developed into reliable starters over guys who were drafted and paid much more money.

"The reason they've been successful is they work at it and they have a history and a tradition," said Phil Savage, the Ravens' director of college scouting from 1996 to 2002, and their director of player personnel in 2003 and 2004. "Really from the moment we got to Baltimore, we put a lot of emphasis on college free agents. I think the Ravens have always approached it like it's the eighth round of the draft and their scouts take great pride in unearthing a player or two. If you can get one of those players on your team, the impact of it on the salary cap is really significant."

The Ravens' current group of undrafted free agents includes wide receiver Marlon Brown, who has quickly moved up the depth chart after his senior season at Georgia was marred by a knee injury; Furstenburg, who is battling with veteran Billy Bajema for the third tight-end spot; and linebacker Brandon Copeland, a former Gilman standout who is getting a shot with his hometown team.

At least one undrafted free agent has made the Ravens' opening-game roster in all five seasons under Harbaugh and eight total have survived final cuts during that span.

"As we go back and look at some of the significant players that have really developed over the years, it really shows you how important the process is," said DeCosta, who credited the work of scouts Mark Azevedo, Ian Cunningham and Joe Douglas, who coordinates the undrafted free-agent signing process. "We plan as much for undrafted free agency quite honestly as we do for the draft. We've learned over the years that you simply have to invest a lot of time in undrafted free agency to make sure it bears fruit. We tweak things every year. We try to be as innovative as we can be with our approach, and we think it works well. We'll continue to try and stay ahead of the curve to beat the other teams because we know the other teams are trying to beat us."

Team officials don't discuss their recruiting methods, though DeCosta acknowledged that the Ravens "try to do things that nobody else is doing and be as aggressive as we can while staying within [league] rules."

What is clear is that the Ravens treat it as a several-month process, identifying players early who might not get drafted and then building relationships with them in the lead-up to the draft. That process includes the traditional interviews, along with countless phone calls and text messages from Harbaugh and position coaches in the days before and during the draft.

"[Run-game coordinator Juan Castillo] was pretty aggressive," said Ravens rookie offensive tackle J.J. Unga, who played college ball at Midwestern State. "He had been calling since as early as February. Even during the draft, every day after every round. Right before the seventh round was gone, he was already on the phone telling me, 'Even if we don't pick you, we're still interested and want you to come here.' It was automatic if they gave me an opportunity, and they did."

DeCosta believes that the relationships the coaches and scouts build with the prospects is one of the most important factors in recruiting college free agents. The Ravens also have plenty to sell. They train in the state-of-the-art Under Armour Performance Center. Their roster is dotted with perennial Pro Bowl selections. They have qualified for the playoffs five straight years and in nine of the past 13 seasons, winning two Super Bowls.

Then, there's the fact that they annually give free agents an opportunity. Holmes signed with the Ravens in 1997 after he went undrafted out of the University of Texas. He rushed for 2,102 yards in four seasons in Baltimore before going to Kansas City, where he became one of the NFL's best backs. Scott played in every game in his rookie season in 2002.

Tucker had a solid career at Texas, but he initially found no NFL kicking jobs waiting. The Ravens eventually signed him after a tryout, and he beat out Billy Cundiff to make the team.